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Schedule of Change in Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Uncertainties [Abstract]
Unrecognized tax benefits at January 1, 2017	$ 3,121
Increase related to positions taken in prior period	771
Increase related to positions taken in current period	294
Decrease related to expiration of statute of limitations	(741)
Unrecognized tax benefits at December 31, 2017	3,445
Accrued interest	569	$ 400
Unrecognized tax benefits recorded in other long-term liabilities at December 31, 2017	$ 4,014

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Amount recognized for uncertainty in income taxes classified as noncurrent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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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