Commitments and Contingencies - Schedule of Changes in General and Professional Liability and Workers Compensation Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Line Items]
Beginning balance	$ 314,941	$ 298,222	$ 274,815
Plus: Accrued insurance expense, net of commercial premiums paid	105,672	92,863	102,595
Less: Payments made in settlement of self-insured claims	(97,789)	(76,144)	(79,188)
Ending balance	322,824	314,941	298,222
General and Professional Liability
Commitments and Contingencies Disclosure [Line Items]
Beginning balance	243,051	228,691	207,459
Plus: Accrued insurance expense, net of commercial premiums paid	56,452	54,387	65,049
Less: Payments made in settlement of self-insured claims	(57,683)	(40,027)	(43,817)
Ending balance	241,820	243,051	228,691
Workers’ Compensation
Commitments and Contingencies Disclosure [Line Items]
Beginning balance	71,890	69,531	67,356
Plus: Accrued insurance expense, net of commercial premiums paid	49,220	38,476	37,546
Less: Payments made in settlement of self-insured claims	(40,106)	(36,117)	(35,371)
Ending balance	$ 81,004	$ 71,890	$ 69,531