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Income Taxes - Schedule of Activity Related to 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 Disclosure [Abstract] |  |  |
Balance at beginning of year | $ 11,185 | $ 10,972 | $ 9,469
Increases related to prior year tax positions | 369 | 385 | 2,284
Decreases related to prior year tax positions |  |  | (143)
Increases related to current year tax positions | 1,700 | 2,900 | 1,430
Decreases related to lapse of statutes of limitation | (5,845) | (3,072) | (2,068)
Balance at end of year | $ 7,409 | $ 11,185 | $ 10,972

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