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Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Income Tax Contingency [Line Items] |
Accrued in connection with the ETFS acquisition | $ 30,466
Increases | 37
Foreign currency translation | (2,164)
Ending balance | 28,339
Unrecognized Tax Benefits [Member] |
Income Tax Contingency [Line Items] |
Accrued in connection with the ETFS acquisition | 25,631
Foreign currency translation | (1,820)
Ending balance | 23,811
Interest and Penalties [Member] |
Income Tax Contingency [Line Items] |
Accrued in connection with the ETFS acquisition | 4,835
Increases | 37
Foreign currency translation | (344)
Ending balance | $ 4,528

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