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Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |
Beginning balance |  | $ 32,101 | $ 34,876
Decrease -Lapse of statute of limitations |  | (5,981) | (4,309)
Increases |  | 320 | 416
Foreign currency translation | [1] | 576 | 1,118
Ending balance |  | 27,016 | 32,101
Unrecognized Tax Benefits [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Beginning balance |  | 25,998 | 28,101
Decrease -Lapse of statute of limitations |  | (4,620) | (2,999)
Foreign currency translation | [1] | 472 | 896
Ending balance |  | 21,850 | 25,998
Interest And Penalties [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Beginning balance |  | 6,103 | 6,775
Decrease -Lapse of statute of limitations |  | (1,361) | (1,310)
Increases |  | 320 | 416
Foreign currency translation | [1] | 104 | 222
Ending balance |  | $ 5,166 | $ 6,103
[1] | 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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- 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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