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Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits - beginning of the year	$ 3,827	$ 1,832
Gross (decreases) related to prior year tax positions	(397)
Gross increases related to prior year tax positions		1,830
Gross increases related to current year tax positions	959	290
Lapse of applicable statute of limitations	(495)	(125)
Gross unrecognized tax benefits - end of year	$ 3,894	$ 3,827

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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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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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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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