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Estimated Values of Gross Uncertain Tax Positions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Contingency [Line Items]      
Beginning Balance $ (572) $ (351) $ (301)
Additions based on tax positions related to the current year (15)   (31)
Additions for tax positions of prior years   (221) (164)
Settlements 430   145
Ending Balance $ (157) $ (572) $ (351)