Commitments and Contingencies - Schedule of Changes in General and Professional Liability and Workers Compensation Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Commitments and Contingencies Disclosure [Line Items]
Beginning balance	$ 259,718	$ 270,088		$ 344,553
Plus: Accrued insurance expense, net of commercial premiums paid	90,895	59,276	[1]	(3,821)	[1]
Less: Payments made in settlement of self-insured claims	(79,137)	(69,646)		(70,644)
Ending balance	271,476	259,718		270,088
General and Professional Liability
Commitments and Contingencies Disclosure [Line Items]
Beginning balance	192,904	206,290		278,599
Plus: Accrued insurance expense, net of commercial premiums paid	58,460	22,601	[1]	(35,182)	[1]
Less: Payments made in settlement of self-insured claims	(47,391)	(35,987)		(37,127)
Ending balance	203,973	192,904		206,290
Workers’ Compensation
Commitments and Contingencies Disclosure [Line Items]
Beginning balance	66,814	63,798		65,954
Plus: Accrued insurance expense, net of commercial premiums paid	32,435	36,675	[1]	31,361	[1]
Less: Payments made in settlement of self-insured claims	(31,746)	(33,659)		(33,517)
Ending balance	$ 67,503	$ 66,814		$ 63,798

[1] General and professional liability amounts are net of adjustments recorded during 2014 and 2013, as discussed below.