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Income Taxes - Change in Unrecognized Income Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of period	$ 2,366	$ 2,226	$ 2,537
Increases for tax position related to, Prior years	3	465	95
Increases for tax position related to, Current year	254	285	428
Decreases for tax positions related to, Prior years		(14)
Expiration of applicable statute of limitations	(755)	(596)	(834)
Balance at end of period	$ 1,868	$ 2,366	$ 2,226

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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
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-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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