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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 2,503,338	$ 1,899,456	$ 2,505,381
Foreign currency translation (loss) gain	82,332	(4,260)	(46,851)
Gain on derivative instruments, net of tax of $0.1 million	(21,566)	19	21,622
U.K. Sale		375,606
Balance	2,606,639	2,434,446	2,606,639
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(373,101)
Foreign currency translation (loss) gain		(4,293)
U.K. Sale		377,394
Change in Fair Value of Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		13,686
Gain on derivative instruments, net of tax of $0.1 million		19
U.K. Sale		(13,705)
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(11,950)
Foreign currency translation (loss) gain		33
U.K. Sale		11,917
Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(500,879)	$ (371,365)	(414,884)
Balance	$ (440,113)		$ (440,113)

X

- Definition

Other comprehensive income loss discontinued operation gain loss from disposal of discontinued operation net of tax.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

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-Publisher FASB
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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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