Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Useful Lives for Amortization (Details)

v3.8.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Useful Lives for Amortization (Details)
 12 Months Ended
Dec. 31, 2017
Trade name  
Finite-Lived Intangible Assets [Line Items]  
Amortization period 30 years
Leasehold intangibles | Lower Range  
Finite-Lived Intangible Assets [Line Items]  
Amortization period 1 year
Leasehold intangibles | Upper Range  
Finite-Lived Intangible Assets [Line Items]  
Amortization period 26 years
Management contracts | Lower Range  
Finite-Lived Intangible Assets [Line Items]  
Amortization period 1 year
Management contracts | Upper Range  
Finite-Lived Intangible Assets [Line Items]  
Amortization period 26 years
Internally-developed software  
Finite-Lived Intangible Assets [Line Items]  
Amortization period 5 years
Membership base  
Finite-Lived Intangible Assets [Line Items]  
Amortization period 7 years