Quarterly report pursuant to Section 13 or 15(d)

REAL ESTATE RELATED LOANS, RESIDENTIAL MORTGAGE LOANS AND SUBPRIME MORTGAGE LOANS - Subprime Mortgage Loans (Details 5)

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REAL ESTATE RELATED LOANS, RESIDENTIAL MORTGAGE LOANS AND SUBPRIME MORTGAGE LOANS - Subprime Mortgage Loans (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Total securitized loans (unpaid principal balance) $ 748,513us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized [1]  
Subprime mortgage loans subject to call option 406,217nct_SubprimeMortgageLoansSubjectToCallOption 406,217nct_SubprimeMortgageLoansSubjectToCallOption
Retained interests (fair value) 2,960us-gaap_RetainedInterestFairValueDisclosure [2]  
Subprime Portfolio I [Member]    
Total securitized loans (unpaid principal balance) 311,133us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIMember 		[1]  
Subprime mortgage loans subject to call option 299,176nct_SubprimeMortgageLoansSubjectToCallOption
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIMember 		 
Retained interests (fair value) 2,960us-gaap_RetainedInterestFairValueDisclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIMember 		[2]  
Subprime Portfolio II [Member]    
Total securitized loans (unpaid principal balance) 437,380us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIIMember 		[1]  
Subprime mortgage loans subject to call option $ 107,041nct_SubprimeMortgageLoansSubjectToCallOption
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIIMember 		 
[1] Average loan seasoning of 116 months and 98 months for Subprime Portfolios I and II, respectively, at March 31, 2015.
[2] The retained interests include retained bonds of the securitizations with negligible monthly interest cash flow until principal payment is available. The fair value of which is estimated based on pricing service quotation. Newcastle's retained interests were written off in 2010. The weighted average yield of the retained bonds was 21.25% as of March 31, 2015.