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Income Taxes - Additional Information (Detail) € in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Apr. 11, 2018 USD ($) | Apr. 11, 2018 EUR (€)
Schedule Of Income Tax [Line Items] |  |  |  |  |  |
Estimated effective rate | 24.60% | 45.50% | 27.60% | 48.80% |  |
Income tax expense | $ 5,460 | $ 10,120 | $ 9,958 | $ 18,062 |  |
Federal statutory rate | 21.00% |  | 21.00% |  |  |
Pre-tax federal net operating losses | $ 3,147 |  | $ 3,147 |  |  |
Pre-tax federal net operating losses expiration date |  |  | 2024 |  |  |
Tax effected NOLs - Foreign |  |  | $ 5,137 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 23,811 |  | $ 23,811 |  |  |
Jersey [Member] |  |  |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |  |  |
Estimated effective rate |  |  | 0.00% |  |  |
Income tax holiday, description |  |  | The gain on revaluation is not adjusted for income taxes as the obligation was assumed by a wholly-owned subsidiary of ours that is based in Jersey, a region where we are subject to a zero percent tax rate. |  |  |
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 | $ 28,339 |  | $ 28,339 |  |  |
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

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