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Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property Plant And Equipment [Abstract]    
Land $ 42,080 $ 35,885
Buildings 437,283 387,621
Leasehold improvements 2,289,425 2,002,735
Equipment and information systems, including internally developed software 2,080,446 1,836,704
New center and capital asset projects in progress 336,513 235,660
Property, Plant and Equipment, Gross, Total 5,185,747 4,498,605
Less accumulated depreciation (2,397,007) (2,029,506)
Property and equipment, net $ 2,788,740 $ 2,469,099