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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at January 1	$ 119,818	$ 116,070	$ 109,347
Increases for positions taken in current year	3,836	7,548	4,171
Increases for positions taken in a prior year	29,487	25,239	19,318
Decreases for positions taken in a prior year	(10,150)	(1,813)	(5,637)
Decreases for settlements with taxing authorities	(1,982)	(1,143)	(2,349)
Decreases for lapses in the applicable statute of limitations	(3,080)	(26,083)	(8,780)
Unrecognized tax benefits at December 31	$ 137,929	$ 119,818	$ 116,070

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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