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Income Taxes - Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefit beginning balance	$ 4,450	$ 4,097	$ 3,586
Increase as a result of tax positions taken during the period	3,846	4,353	2,354
Decrease as a result of tax positions taken during the period	(2,850)	(2,311)	(1,356)
Decrease as a result of expiring statutes	(97)	(1,689)	(487)
Unrecognized tax benefit ending balance	$ 5,349	$ 4,450	$ 4,097

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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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 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 decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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