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Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Beginning balance |  | $ 22,427 | $ 22,222 | $ 27,016 |  | $ 27,016 |
Decrease -Lapse of statute of limitations |  |  |  | (5,171) | [1] | (5,171) | $ (5,981)
Increases |  | 39 | 40 |  |  |  |
Foreign currency translation | [2] | (594) | 165 | 338 |  |  |
Ending balance |  | 21,872 | 22,427 | 22,222 |  | 21,872 |
Unrecognized Tax Benefits [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 18,702 | 18,564 | 21,850 |  | 21,850 |
Decrease -Lapse of statute of limitations | [1] |  |  | (3,559) |  |  |
Increases |  |  |  |  |  |  |
Foreign currency translation | [2] | (496) | 138 | 273 |  |  |
Ending balance |  | 18,206 | 18,702 | 18,564 |  | 18,206 |
Interest And Penalties [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 3,725 | 3,658 | 5,166 |  | 5,166 |
Decrease -Lapse of statute of limitations | [1] |  |  | (1,612) |  |  |
Increases |  | 39 | 40 | 39 |  |  |
Foreign currency translation | [2] | (98) | 27 | 65 |  |  |
Ending balance |  | $ 3,666 | $ 3,725 | $ 3,658 |  | $ 3,666 |
[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.
[2] | The gross unrecognized tax benefits were accrued in British pounds.

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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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- Definition Amount of increase in unrecognized tax benefits and interest/penalties resulting from tax positions that have been or will be taken in current period tax return. + References No definition available. + Details
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