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Income Taxes - Additional Information (Detail) € in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Apr. 11, 2018 USD ($) | Apr. 11, 2018 EUR (€)
Schedule Of Income Tax [Line Items] |  |  |  |  |  |  |
Estimated effective rate | 19.90% | 19.90% | 48.50% | 24.30% | 48.70% |  |
Income tax expense | $ 5,481 |  | $ 7,520 | $ 15,439 | $ 25,582 |  |
Federal statutory rate | 21.00% | 21.00% | 35.00% | 21.00% | 35.00% |  |
Pre-tax federal net operating losses | $ 3,147 |  |  | $ 3,147 |  |  |
Pre-tax federal net operating losses expiration date |  |  |  | 2024 |  |  |
Tax effected NOLs - Foreign |  |  |  | $ 5,747 |  |  |
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return | 35,654 |  |  | 35,654 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 28,826 |  |  | 28,826 |  |  |
Acquisition of ETFS Business [Member] |  |  |  |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |  |  |  |
Accrued uncertain tax position liability |  |  |  |  |  | $ 25,631 | € 18,102
Interest and penalties |  |  |  |  |  | $ 4,835 | € 3,415
Adjustment to unrecognized tax benefits accrued uncertain tax position liability | 5,686 | € 4,016 |  |  |  |  |
Adjustment to unrecognized tax benefits accrued interest and penalties | 2,336 | € 1,650 |  |  |  |  |
Other Noncurrent Liabilities [Member] |  |  |  |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |  |  |  |
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return | $ 35,654 |  |  | $ 35,654 |  |  |

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