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Schedule of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Beginning balance, as of January 1	$ 21,180	$ 43,395	$ 36,263
Tax positions for current year, Additions	1,082	1,322	4,716
Tax positions for prior years, Additions	66	8,043	2,626
Tax positions for prior years, Reductions	(2,989)	(31,397)	(153)
Expiration of statutes, Reductions	(1,436)	(183)	(57)
Ending balance as of December 31	$ 17,903	$ 21,180	$ 43,395

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Income Tax Disclosure [Line Items]

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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