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Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Income Tax Contingency [Line Items] |
Accrued in connection with the ETFS acquisition | $ 38,488
Increases | 227
Foreign currency translation | (3,061)
Ending balance | 35,654
Unrecognized Tax Benefits [Member] |
Income Tax Contingency [Line Items] |
Accrued in connection with the ETFS acquisition | 31,317
Foreign currency translation | (2,491)
Ending balance | 28,826
Interest and Penalties [Member] |
Income Tax Contingency [Line Items] |
Accrued in connection with the ETFS acquisition | 7,171
Increases | 227
Foreign currency translation | (570)
Ending balance | $ 6,828

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