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Estimated Values of Gross Uncertain Tax Positions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Balance at January 1	$ (161)	$ (109)	$ (157)
Additions based on tax positions related to the current year	(626)	(82)
Additions based on tax positions related to the prior year	(1,302)
Reduction for tax positions of prior years	114	30
Settlements			48
Balance at December 31	$ (1,975)	$ (161)	$ (109)

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