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Estimated Values of Gross Uncertain Tax Positions (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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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