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Acquisition - Schedule of Allocated Purchase Consideration (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Mar. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 176,981 $ 176,981  
Franchisee Acquisition [Member]      
Business Acquisition [Line Items]      
Fixed assets     $ 7,634
Favorable leases, net     700
Other assets     35
Goodwill     19,771
Liabilities assumed, including deferred revenues     (1,334)
Total     41,638
Franchisee Acquisition [Member] | Reacquired Franchise Rights [Member]      
Business Acquisition [Line Items]      
Intangible assets     8,950
Franchisee Acquisition [Member] | Membership Relationships [Member]      
Business Acquisition [Line Items]      
Intangible assets     $ 5,882