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Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |
Beginning balance | $ 34,876 |
Decrease—Lapse of statute of limitations | (4,309) |
Accrued in connection with the ETFS Acquisition |  | $ 38,488
Increases | 416 | 346
Foreign currency translation | 1,118 | (3,958)
Ending balance | 32,101 | 34,876
Unrecognized Tax Benefits [Member] |  |
Income Tax Contingency [Line Items] |  |
Beginning balance | 28,101 |
Decrease—Lapse of statute of limitations | (2,999) |
Accrued in connection with the ETFS Acquisition |  | 31,317
Increases | 0 |
Foreign currency translation | 896 | (3,216)
Ending balance | 25,998 | 28,101
Interest And Penalties [Member] |  |
Income Tax Contingency [Line Items] |  |
Beginning balance | 6,775 |
Decrease—Lapse of statute of limitations | (1,310) |
Accrued in connection with the ETFS Acquisition |  | 7,171
Increases | 416 | 346
Foreign currency translation | 222 | (742)
Ending balance | $ 6,103 | $ 6,775

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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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- Definition Amount of increase in unrecognized tax benefits and interest/penalties resulting from acquisitions. + References No definition available. + 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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