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Sale of Building (Details)
ft² in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 23, 2015
USD ($)
Sep. 12, 2014
USD ($)
Mar. 31, 2016
ft²
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Leases [Abstract]          
Gross proceeds from legal sale of property, accounted for as building financing arrangement   $ 85,650      
Area of new club lease (in square feet) | ft²     24    
Escrow amounts related to property sale         $ 500
Proceeds from building financing arrangement $ 3,500        
Gain on sale of building       $ 77,146