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Income Taxes - Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefit beginning balance | $ 5,349 | $ 4,450 | $ 4,097
Increase as a result of tax positions taken during the period | 2,866 | 3,846 | 4,353
Decrease as a result of tax positions taken during the period | (2,482) | (2,850) | (2,311)
Decrease as a result of expiring statutes | (16) | (97) | (1,689)
Unrecognized tax benefit ending balance | $ 5,717 | $ 5,349 | $ 4,450

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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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