| DEBT OBLIGATIONS - Debt Obligations (Details) (USD $)In Thousands, unless otherwise specified
 | 3 Months Ended | 
      
        | Mar. 31, 2015 | 
      
        | Debt Face Amount | $ 1,286,504us-gaap_DebtInstrumentFaceAmount |  | 
      
        | Carrying Value | 1,283,837us-gaap_DebtInstrumentCarryingAmount | [1] | 
      
        | CDO VI Bonds Payable [Member] |  |  | 
      
        | Month Issued | 2005-04 | [2] | 
      
        | Debt Face Amount | 92,576us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_CDOVIMember
 | [2] | 
      
        | Carrying Value | 92,576us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_CDOVIMember
 | [2] | 
      
        | Final Stated Maturity | 2040-04 | [2] | 
      
        | Weighted Average Coupon - Rate | 0.87%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis
 = nct_CDOVIMember
 | [2],[3] | 
      
        | Weighted Average Funding Cost | 0.86%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_CDOVIMember
 | [2],[4] | 
      
        | Weighted Average Life (Years) | 4 years 9 months 18 days | [2] | 
      
        | Face Amount of Floating Rate Debt | 89,005nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = nct_CDOVIMember
 | [2] | 
      
        | Outstanding Face Amount of Collateral | 96,288nct_DebtOutstandingFaceCollateral / us-gaap_DebtInstrumentAxis
 = nct_CDOVIMember
 | [2],[5] | 
      
        | Amortized Cost Basis of Collateral | 35,093nct_DebtAmortizedCostCollateral / us-gaap_DebtInstrumentAxis
 = nct_CDOVIMember
 | [2],[5] | 
      
        | Carrying Value of Collateral | 67,432us-gaap_DebtInstrumentCollateralAmount / us-gaap_DebtInstrumentAxis
 = nct_CDOVIMember
 | [2],[5] | 
      
        | Weighted Average Maturity (Years) Of Collateral | 4 years 9 months 18 days | [2] | 
      
        | Floating Rate Face Amount of Collateral | 28,869nct_DebtFloatingRateFaceAmountCollateral / us-gaap_DebtInstrumentAxis
 = nct_CDOVIMember
 | [2],[5] | 
      
        | Aggregate Notional Amount of Current Hedges |  |  | 
      
        | CDO VIII Bonds Payable [Member] |  |  | 
      
        | Month Issued | 2006-11 |  | 
      
        | Debt Face Amount | 71,813us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_CDOVIIIMember
 |  | 
      
        | Carrying Value | 71,727us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_CDOVIIIMember
 |  | 
      
        | Final Stated Maturity | 2052-11 |  | 
      
        | Weighted Average Coupon - Rate | 2.13%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis
 = nct_CDOVIIIMember
 | [3] | 
      
        | Weighted Average Funding Cost | 6.56%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_CDOVIIIMember
 | [4] | 
      
        | Weighted Average Life (Years) | 1 year 8 months 12 days |  | 
      
        | Face Amount of Floating Rate Debt | 64,213nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = nct_CDOVIIIMember
 |  | 
      
        | Outstanding Face Amount of Collateral | 192,392nct_DebtOutstandingFaceCollateral / us-gaap_DebtInstrumentAxis
 = nct_CDOVIIIMember
 | [5] | 
      
        | Amortized Cost Basis of Collateral | 134,997nct_DebtAmortizedCostCollateral / us-gaap_DebtInstrumentAxis
 = nct_CDOVIIIMember
 | [5] | 
      
        | Carrying Value of Collateral | 144,945us-gaap_DebtInstrumentCollateralAmount / us-gaap_DebtInstrumentAxis
 = nct_CDOVIIIMember
 | [5] | 
      
        | Weighted Average Maturity (Years) Of Collateral | 1 year 9 months 18 days |  | 
      
        | Floating Rate Face Amount of Collateral | 52,220nct_DebtFloatingRateFaceAmountCollateral / us-gaap_DebtInstrumentAxis
 = nct_CDOVIIIMember
 | [5] | 
      
        | Aggregate Notional Amount of Current Hedges | 57,903nct_DebtAggregateNotionalAmountCurrentHedges / us-gaap_DebtInstrumentAxis
 = nct_CDOVIIIMember
 |  | 
      
        | CDO IX Bonds Payable [Member] |  |  | 
      
        | Month Issued | 2007-05 |  | 
      
        | Debt Face Amount | 51,371us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_CDOIXMember
 |  | 
      
        | Carrying Value | 52,161us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_CDOIXMember
 |  | 
      
        | Final Stated Maturity | 2052-05 |  | 
      
        | Weighted Average Coupon - Rate | 0.77%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis
 = nct_CDOIXMember
 | [3] | 
      
        | Weighted Average Funding Cost | 0.21%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_CDOIXMember
 | [4] | 
      
        | Weighted Average Life (Years) | 1 year 6 months |  | 
      
        | Face Amount of Floating Rate Debt | 51,371nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = nct_CDOIXMember
 |  | 
      
        | Outstanding Face Amount of Collateral | 273,680nct_DebtOutstandingFaceCollateral / us-gaap_DebtInstrumentAxis
 = nct_CDOIXMember
 | [5] | 
      
        | Amortized Cost Basis of Collateral | 217,877nct_DebtAmortizedCostCollateral / us-gaap_DebtInstrumentAxis
 = nct_CDOIXMember
 | [5] | 
      
        | Carrying Value of Collateral | 228,059us-gaap_DebtInstrumentCollateralAmount / us-gaap_DebtInstrumentAxis
 = nct_CDOIXMember
 | [5] | 
      
        | Weighted Average Maturity (Years) Of Collateral | 2 years 3 months 19 days |  | 
      
        | Floating Rate Face Amount of Collateral | 35,946nct_DebtFloatingRateFaceAmountCollateral / us-gaap_DebtInstrumentAxis
 = nct_CDOIXMember
 | [5] | 
      
        | Total CDO Bonds Payable [Member] |  |  | 
      
        | Debt Face Amount | 215,760us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_SecuredDebtMember
 |  | 
      
        | Carrying Value | 216,464us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_SecuredDebtMember
 |  | 
      
        | Weighted Average Funding Cost | 2.59%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = us-gaap_SecuredDebtMember
 | [4] | 
      
        | Weighted Average Life (Years) | 3 years |  | 
      
        | Face Amount of Floating Rate Debt | 204,589nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = us-gaap_SecuredDebtMember
 |  | 
      
        | Outstanding Face Amount of Collateral | 562,360nct_DebtOutstandingFaceCollateral / us-gaap_DebtInstrumentAxis
 = us-gaap_SecuredDebtMember
 | [5] | 
      
        | Amortized Cost Basis of Collateral | 387,967nct_DebtAmortizedCostCollateral / us-gaap_DebtInstrumentAxis
 = us-gaap_SecuredDebtMember
 | [5] | 
      
        | Carrying Value of Collateral | 440,436us-gaap_DebtInstrumentCollateralAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_SecuredDebtMember
 | [5] | 
      
        | Weighted Average Maturity (Years) Of Collateral | 2 years 6 months |  | 
      
        | Floating Rate Face Amount of Collateral | 117,035nct_DebtFloatingRateFaceAmountCollateral / us-gaap_DebtInstrumentAxis
 = us-gaap_SecuredDebtMember
 | [5] | 
      
        | Aggregate Notional Amount of Current Hedges | 57,903nct_DebtAggregateNotionalAmountCurrentHedges / us-gaap_DebtInstrumentAxis
 = us-gaap_SecuredDebtMember
 |  | 
      
        | NCT 2013-VI IMM-1 [Member] |  |  | 
      
        | Month Issued | 2013-11 | [6] | 
      
        | Debt Face Amount | 28,563us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_NCTNotePayableMember
 | [6] | 
      
        | Carrying Value | 25,317us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_NCTNotePayableMember
 | [6] | 
      
        | Final Stated Maturity | 2040-04 | [6] | 
      
        | Weighted Average Coupon - Basis for Variable Rate | LIBOR | [3],[6] | 
      
        | Weighted Average Coupon - Spread on Basis for Variable Rate | 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis
 = nct_NCTNotePayableMember
 | [3],[6] | 
      
        | Weighted Average Funding Cost | 6.87%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_NCTNotePayableMember
 | [4] | 
      
        | Weighted Average Life (Years) | 2 years 2 months 12 days | [6] | 
      
        | Face Amount of Floating Rate Debt | 28,563nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = nct_NCTNotePayableMember
 |  | 
      
        | Total Other Bonds And Notes Payable [Member] |  |  | 
      
        | Debt Face Amount | 28,563us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_OtherBondsNotesPayableMember
 | [7] | 
      
        | Carrying Value | 25,317us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_OtherBondsNotesPayableMember
 | [7] | 
      
        | Weighted Average Funding Cost | 6.87%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_OtherBondsNotesPayableMember
 | [4] | 
      
        | Weighted Average Life (Years) | 2 years 2 months 12 days |  | 
      
        | Face Amount of Floating Rate Debt | 28,563nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = nct_OtherBondsNotesPayableMember
 |  | 
      
        | CDO Securities Repurchase Agreements [Member] |  |  | 
      
        | Month Issued | 2015-03 | [6],[8] | 
      
        | Debt Face Amount | 35,683us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_CDODebtSecuritiesMember
 | [6] | 
      
        | Carrying Value | 35,683us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_CDODebtSecuritiesMember
 | [6] | 
      
        | Final Stated Maturity | 2015-04 | [6],[8] | 
      
        | Weighted Average Coupon - Basis for Variable Rate | LIBOR | [3],[6],[8] | 
      
        | Weighted Average Coupon - Spread on Basis for Variable Rate | 1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis
 = nct_CDODebtSecuritiesMember
 | [3],[6],[8] | 
      
        | Weighted Average Funding Cost | 1.83%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_CDODebtSecuritiesMember
 | [4] | 
      
        | Weighted Average Life (Years) | 1 month 6 days | [6],[8] | 
      
        | Face Amount of Floating Rate Debt | 35,683nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = nct_CDODebtSecuritiesMember
 |  | 
      
        | FNMA/FHLMC Securities Repurchase Agreements [Member] |  |  | 
      
        | Month Issued | 2015-03 | [8] | 
      
        | Debt Face Amount | 386,120us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_USGovernmentAgenciesDebtSecurities1Member
 |  | 
      
        | Carrying Value | 386,120us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_USGovernmentAgenciesDebtSecurities1Member
 |  | 
      
        | Final Stated Maturity | 2015-04 | [8] | 
      
        | Weighted Average Coupon - Rate | 0.37%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis
 = nct_USGovernmentAgenciesDebtSecurities1Member
 | [3] | 
      
        | Weighted Average Funding Cost | 0.37%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_USGovernmentAgenciesDebtSecurities1Member
 | [4] | 
      
        | Weighted Average Life (Years) | 1 month 6 days | [8] | 
      
        | Outstanding Face Amount of Collateral | 389,056nct_DebtOutstandingFaceCollateral / us-gaap_DebtInstrumentAxis
 = nct_USGovernmentAgenciesDebtSecurities1Member
 | [5] | 
      
        | Amortized Cost Basis of Collateral | 407,494nct_DebtAmortizedCostCollateral / us-gaap_DebtInstrumentAxis
 = nct_USGovernmentAgenciesDebtSecurities1Member
 | [5] | 
      
        | Carrying Value of Collateral | 409,037us-gaap_DebtInstrumentCollateralAmount / us-gaap_DebtInstrumentAxis
 = nct_USGovernmentAgenciesDebtSecurities1Member
 | [5] | 
      
        | Weighted Average Maturity (Years) Of Collateral | 7 years 1 month 6 days | [8] | 
      
        | Total Repurchase Agreements [Member] |  |  | 
      
        | Debt Face Amount | 421,803us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_DebtRepurchaseAgreementsMember
 |  | 
      
        | Carrying Value | 421,803us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_DebtRepurchaseAgreementsMember
 |  | 
      
        | Weighted Average Funding Cost | 0.49%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_DebtRepurchaseAgreementsMember
 | [4] | 
      
        | Weighted Average Life (Years) | 1 month 6 days | [8] | 
      
        | Face Amount of Floating Rate Debt | 35,683nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = nct_DebtRepurchaseAgreementsMember
 |  | 
      
        | Outstanding Face Amount of Collateral | 389,056nct_DebtOutstandingFaceCollateral / us-gaap_DebtInstrumentAxis
 = nct_DebtRepurchaseAgreementsMember
 | [5] | 
      
        | Amortized Cost Basis of Collateral | 407,494nct_DebtAmortizedCostCollateral / us-gaap_DebtInstrumentAxis
 = nct_DebtRepurchaseAgreementsMember
 | [5] | 
      
        | Carrying Value of Collateral | 409,037us-gaap_DebtInstrumentCollateralAmount / us-gaap_DebtInstrumentAxis
 = nct_DebtRepurchaseAgreementsMember
 | [5] | 
      
        | Weighted Average Maturity (Years) Of Collateral | 7 years 1 month 6 days | [8] | 
      
        | Golf First Lien Loan [Member] |  |  | 
      
        | Month Issued | 2013-12 | [9] | 
      
        | Debt Face Amount | 51,423us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_GolfFirstLienLoanAMember
 |  | 
      
        | Carrying Value | 51,308us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_GolfFirstLienLoanAMember
 |  | 
      
        | Final Stated Maturity | 2017-12 | [9] | 
      
        | Weighted Average Coupon - Basis for Variable Rate | LIBOR | [10],[3],[9] | 
      
        | Weighted Average Coupon - Spread on Basis for Variable Rate | 4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis
 = nct_GolfFirstLienLoanAMember
 | [10],[3],[9] | 
      
        | Weighted Average Funding Cost | 4.58%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_GolfFirstLienLoanAMember
 | [4] | 
      
        | Weighted Average Life (Years) | 2 years 9 months 18 days | [9] | 
      
        | Face Amount of Floating Rate Debt | 51,423nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = nct_GolfFirstLienLoanAMember
 |  | 
      
        | Golf Second Lien Loan [Member] |  |  | 
      
        | Month Issued | 2013-12 | [9] | 
      
        | Debt Face Amount | 105,575us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_GolfSecondLienLoanMember
 |  | 
      
        | Carrying Value | 105,339us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_GolfSecondLienLoanMember
 |  | 
      
        | Final Stated Maturity | 2017-12 | [9] | 
      
        | Weighted Average Coupon - Rate | 5.50%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis
 = nct_GolfSecondLienLoanMember
 | [3] | 
      
        | Weighted Average Funding Cost | 5.58%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_GolfSecondLienLoanMember
 | [4] | 
      
        | Weighted Average Life (Years) | 2 years 9 months 18 days | [9] | 
      
        | Golf Vineyard II [Member] |  |  | 
      
        | Month Issued | 1993-12 | [9] | 
      
        | Debt Face Amount | 200us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_GolfVineyardIIMember
 | [9] | 
      
        | Carrying Value | 200us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_GolfVineyardIIMember
 | [9] | 
      
        | Final Stated Maturity | 2043-12 | [9] | 
      
        | Weighted Average Coupon - Rate | 2.11%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis
 = nct_GolfVineyardIIMember
 | [3],[9] | 
      
        | Weighted Average Funding Cost | 2.11%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_GolfVineyardIIMember
 | [4],[9] | 
      
        | Weighted Average Life (Years) | 28 years 8 months 12 days | [9] | 
      
        | Face Amount of Floating Rate Debt | 200nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = nct_GolfVineyardIIMember
 | [9] | 
      
        | Capital Lease Equipment [Member] |  |  | 
      
        | Debt Face Amount | 5,959us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_CapitalLeaseObligationsMember
 | [9] | 
      
        | Carrying Value | 5,959us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_CapitalLeaseObligationsMember
 | [9] | 
      
        | Final Stated Maturity | 2020-09 | [9] | 
      
        | Weighted Average Funding Cost | 6.77%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = us-gaap_CapitalLeaseObligationsMember
 | [4],[9] | 
      
        | Weighted Average Life (Years) | 5 years 6 months | [9] | 
      
        | Capital Lease Equipment [Member] | Lower Range |  |  | 
      
        | Month Issued | 2014-05 | [9] | 
      
        | Weighted Average Coupon - Rate | 4.80%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis
 = us-gaap_CapitalLeaseObligationsMember
 / us-gaap_RangeAxis
 = us-gaap_MinimumMember
 | [3],[9] | 
      
        | Capital Lease Equipment [Member] | Upper Range |  |  | 
      
        | Month Issued | 2015-03 | [9] | 
      
        | Weighted Average Coupon - Rate | 7.15%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis
 = us-gaap_CapitalLeaseObligationsMember
 / us-gaap_RangeAxis
 = us-gaap_MaximumMember
 | [3],[9] | 
      
        | Total Golf Credit Facilities [Member] |  |  | 
      
        | Debt Face Amount | 163,157us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = nct_GolfCreditFacilitiesMember
 |  | 
      
        | Carrying Value | 162,806us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = nct_GolfCreditFacilitiesMember
 |  | 
      
        | Weighted Average Funding Cost | 5.30%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = nct_GolfCreditFacilitiesMember
 | [4] | 
      
        | Weighted Average Life (Years) | 2 years 10 months 25 days | [9] | 
      
        | Face Amount of Floating Rate Debt | 51,623nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = nct_GolfCreditFacilitiesMember
 |  | 
      
        | Junior Subordinated Notes Payable [Member] |  |  | 
      
        | Month Issued | 2006-03 |  | 
      
        | Debt Face Amount | 51,004us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_JuniorSubordinatedDebtMember
 |  | 
      
        | Carrying Value | 51,230us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_JuniorSubordinatedDebtMember
 |  | 
      
        | Final Stated Maturity | 2035-04 |  | 
      
        | Weighted Average Coupon - Rate | 7.57%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis
 = us-gaap_JuniorSubordinatedDebtMember
 | [11],[3] | 
      
        | Weighted Average Coupon - Spread on Basis for Variable Rate | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis
 = us-gaap_JuniorSubordinatedDebtMember
 |  | 
      
        | Weighted Average Funding Cost | 7.36%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = us-gaap_JuniorSubordinatedDebtMember
 | [4] | 
      
        | Weighted Average Life (Years) | 20 years 1 month 6 days |  | 
      
        | Total Corporate [Member] |  |  | 
      
        | Debt Face Amount | 51,004us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_CorporateDebtSecuritiesMember
 |  | 
      
        | Carrying Value | 51,230us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_CorporateDebtSecuritiesMember
 |  | 
      
        | Weighted Average Funding Cost | 7.36%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = us-gaap_CorporateDebtSecuritiesMember
 | [4] | 
      
        | Weighted Average Life (Years) | 20 years 1 month 6 days |  | 
      
        | Subtotal Debt Obligations [Member] |  |  | 
      
        | Debt Face Amount | 880,287us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_DebtSecuritiesPayableMember
 |  | 
      
        | Carrying Value | 877,620us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_DebtSecuritiesPayableMember
 |  | 
      
        | Weighted Average Funding Cost | 2.49%nct_DebtWeightedAverageFundingCost / us-gaap_DebtInstrumentAxis
 = us-gaap_DebtSecuritiesPayableMember
 | [4] | 
      
        | Weighted Average Life (Years) | 2 years 7 months 6 days |  | 
      
        | Face Amount of Floating Rate Debt | 320,458nct_DebtFloatingRateFace / us-gaap_DebtInstrumentAxis
 = us-gaap_DebtSecuritiesPayableMember
 |  | 
      
        | Outstanding Face Amount of Collateral | 951,416nct_DebtOutstandingFaceCollateral / us-gaap_DebtInstrumentAxis
 = us-gaap_DebtSecuritiesPayableMember
 | [5] | 
      
        | Amortized Cost Basis of Collateral | 795,461nct_DebtAmortizedCostCollateral / us-gaap_DebtInstrumentAxis
 = us-gaap_DebtSecuritiesPayableMember
 | [5] | 
      
        | Carrying Value of Collateral | 849,473us-gaap_DebtInstrumentCollateralAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_DebtSecuritiesPayableMember
 | [5] | 
      
        | Weighted Average Maturity (Years) Of Collateral | 4 years 4 months 24 days |  | 
      
        | Floating Rate Face Amount of Collateral | 117,035nct_DebtFloatingRateFaceAmountCollateral / us-gaap_DebtInstrumentAxis
 = us-gaap_DebtSecuritiesPayableMember
 | [5] | 
      
        | Aggregate Notional Amount of Current Hedges | 57,903nct_DebtAggregateNotionalAmountCurrentHedges / us-gaap_DebtInstrumentAxis
 = us-gaap_DebtSecuritiesPayableMember
 |  | 
      
        | Financing on subprime mortgage loans subject to call option [Member] |  |  | 
      
        | Debt Face Amount | 406,217us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_ResidentialPortfolioSegmentMember
 | [12] | 
      
        | Carrying Value | $ 406,217us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis
 = us-gaap_ResidentialPortfolioSegmentMember
 | [12] | 
      
        |  | 
      
        |  |