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Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits, beginning of the year	$ 9,009	$ 8,564	$ 8,132
Additions for tax positions of prior years		5	24
Additions for tax positions related to the current year	1,957	1,839	1,625
Reductions for tax positions of prior years	(58)
Reductions due to lapse of applicable statute of limitations	(1,049)	(1,399)	(1,217)
Subtotal	9,859	9,009	8,564
Interest and penalties	1,901	1,862	1,909
Total gross unrecognized tax benefits, end of the year	$ 11,760	$ 10,871	$ 10,473

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Unrecognized tax benefits before interest and penalties.

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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 expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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