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Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 131,608	$ 152,581	$ 47,109
Increases resulting from tax positions taken during a prior period	4,121	7,482	110,894
Decreases resulting from tax positions taken during a prior period	0	(7,025)	(3,285)
Increases resulting from tax positions taken during the current period	3,169	1,656	817
Decreases related to settlements with taxing authorities	(601)	(3,594)	(123)
Reductions related to the lapse of statute of limitations	(86,138)	(19,492)	(2,831)
Unrecognized tax benefits at end of year	$ 52,159	$ 131,608	$ 152,581

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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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Amount of decrease 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 settlements with taxing authorities.

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