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Activity Related to Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefit beginning Balance	$ 54,775	$ 37,403	$ 34,112
Increases related to prior year tax positions	281	6,103
Increases related to current year tax positions	9,519	11,726	3,291
Expiration of the statute of limitations for the assessment of taxes	(657)	(457)
Unrecognized tax benefit ending Balance	$ 63,918	$ 54,775	$ 37,403

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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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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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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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