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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, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Beginning balance |  | $ 24,364 | $ 24,429 | $ 32,101 |  | $ 32,101 |
Decrease -Lapse of statute of limitations |  |  |  | (5,981) | [1] | (5,981) | $ (4,309)
Increases |  | 81 | 76 | 76 |  |  |
Foreign currency translation | [2] | 1,057 | (141) | (1,767) |  |  |
Ending balance |  | 25,502 | 24,364 | 24,429 |  | 25,502 |
Unrecognized Tax Benefits [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 19,831 | 19,946 | 25,998 |  | 25,998 |
Decrease -Lapse of statute of limitations | [1] |  |  | (4,620) |  |  |
Foreign currency translation | [2] | 860 | (115) | (1,432) |  |  |
Ending balance |  | 20,691 | 19,831 | 19,946 |  | 20,691 |
Interest And Penalties [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 4,533 | 4,483 | 6,103 |  | 6,103 |
Decrease -Lapse of statute of limitations | [1] |  |  | (1,361) |  |  |
Increases |  | 81 | 76 | 76 |  |  |
Foreign currency translation | [2] | 197 | (26) | (335) |  |  |
Ending balance |  | $ 4,811 | $ 4,533 | $ 4,483 |  | $ 4,811 |
[1] | Recorded as an income tax benefit of $5,981 during the nine months ended September 30, 2020, 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, 2019, an income tax benefit of $4,309 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=84230637&loc=SL6600010-109319 + Details
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