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Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Reduction in unrecognized tax benefits | $ 5,171 | [1] | $ 5,171 | $ 5,981
[1] | Recorded as an income tax benefit of $5,171 during the nine months ended September 30, 2021, along with an equal and offsetting amount recorded in other gains and losses, net, to recognize a reduction in the indemnification asset. During the nine months ended September 30, 2020, an income tax benefit of $5,981 was recorded along with an equal and offsetting amount in other gains and losses, net.

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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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