U.K. Sale - Result of Operation (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations	$ (12,641)	$ (812,390)	$ 56,812
Discontinued Operations [Member] \| U.K. Sales [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	62,520	1,119,768	1,099,081
Salaries, wages and benefits	35,937	632,134	609,823
Professional fees	6,815	127,291	122,532
Supplies	2,217	38,285	37,527
Rents and leases	2,509	47,748	46,743
Other operating expenses	6,682	113,534	115,897
Depreciation and amortization		74,935	76,121
Interest expense, net	10	(417)	(231)
Loss on sale	13,490	867,324
Loss on impairment		20,239	27,169
Transaction-related expenses	6,265	8,719	5,907
Total expenses	73,925	1,929,792	1,041,488
(Loss) income from discontinued operations before income taxes	(11,405)	(810,024)	57,593
Provision for income taxes	1,236	2,366	781
(Loss) income from discontinued operations	$ (12,641)	$ (812,390)	$ 56,812

Disposal group including discontinued operation impairment loss.

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Disposal group including discontinued operation interest expense net.

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Disposal group including discontinued operation rents and leases.

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Disposal group including discontinued operation supplies.

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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