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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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