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Property and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Medical and other equipment held under capital leases $ 202,968 $ 162,943  
Accumulated depreciation of property and equipment held under capital leases 119,334 96,895  
Recorded depreciation expense 22,200 15,900 $ 15,500
Medical and Other Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Medical and other equipment held under capital leases 5,400 2,400  
Accumulated depreciation of property and equipment held under capital leases $ 2,300 $ 1,400