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Changes in Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |
Beginning balance | $ 4,902 | $ 4,225 | $ 3,695
Additions based on tax positions related to the current year | 1,027 | 960 | 801
Reductions due to lapse of applicable statute of limitations | (562) | (283) | (271)
Ending balance | $ 5,367 | $ 4,902 | $ 4,225

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