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Segment Information - Summary of Reconciliation of Segment EBITDA to Income before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 780,232	$ 777,251	$ 789,362	$ 760,617	$ 743,547	$ 760,916	$ 765,738	$ 742,241	$ 3,107,462	$ 3,012,442	$ 2,836,316
Segment EBITDA									585,883	593,576	604,359
Equity-based compensation expense									(17,307)	(22,001)	(23,467)
Debt extinguishment costs										(1,815)	(810)
Legal settlements expense					(22,100)					(22,076)
Loss on impairment	(54,400)				(337,900)				(54,386)	(337,889)
Transaction-related expenses									(27,064)	(34,507)	(24,267)
Interest expense, net									(187,094)	(185,410)	(176,007)
Depreciation and amortization									(164,044)	(158,832)	(143,010)
Income (loss) before income taxes	(10,248)	$ 49,560	$ 59,805	$ 36,871	$ (341,336)	$ 55,036	$ 69,258	$ 48,088	135,988	(168,954)	236,798
U.S. Facilities [Member]
Segment Reporting Information [Line Items]
Revenue									2,008,381	1,904,695	1,809,844
Loss on impairment	(27,200)
U.S. Facilities [Member] | Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue									2,008,381	1,904,695	1,809,844
Segment EBITDA									503,358	488,207	475,260
U.K. Facilities [Member]
Segment Reporting Information [Line Items]
Revenue									1,099,081	1,107,747	1,026,472
Loss on impairment	$ (27,200)
U.K. Facilities [Member] | Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue									1,099,081	1,107,747	1,026,472
Segment EBITDA									166,693	185,755	198,566
Corporate and Other [Member] | Corporate Reconciling Items and Eliminations [Member]
Segment Reporting Information [Line Items]
Segment EBITDA									$ (84,168)	$ (80,386)	$ (69,467)

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