Transactions, Deconsolidations, Closures and Sales - Summary of Acquired Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Business Acquisition [Line Items]  
Estimated Fair Value on Acquisition Date $ 34,500
Estimated Useful Life 10 years 7 months 6 days [1]
Licensing Agreements  
Business Acquisition [Line Items]  
Estimated Fair Value on Acquisition Date 7,100
Estimated Useful Life 14 years 7 months 6 days [1]
Management Agreements  
Business Acquisition [Line Items]  
Estimated Fair Value on Acquisition Date 13,200
Estimated Useful Life 14 years 7 months 6 days [1]
Noncompete Agreements  
Business Acquisition [Line Items]  
Estimated Fair Value on Acquisition Date $ 14,300
Estimated Useful Life 4 years 9 months 18 days [1]
[1] Reflects the weighted average estimated useful life of acquired intangible assets that are subject to amortization.