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Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits - beginning of the year	$ 3,894	$ 3,827
Gross (decreases) related to prior year tax positions		(397)
Gross increases related to prior year tax positions	74
Gross increases related to current year tax positions	506	959
Lapse of applicable statute of limitations	(405)	(495)
Gross unrecognized tax benefits - end of year	$ 4,069	$ 3,894

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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 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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