Income Taxes - Reconciliation of Beginning and Ending Amounts of 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 benefits-January 1	$ 17,097	$ 6,157	$ 5,604
Additions for tax positions of current period	(203)
Additions for tax positions of current period		234	634
Additions for tax positions of prior periods	642	10,866
Reductions for tax positions of prior periods	(1,834)	(100)	(81)
Reductions due to statute of limitations	(162)	(60)
Unrecognized tax benefits—December 31	$ 15,540	$ 17,097	$ 6,157

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Amount of unrecognized tax benefits.

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

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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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