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Business Combination - Additional Information (Detail) - USD ($)			3 Months Ended		9 Months Ended
		Apr. 11, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gain on revaluation of deferred consideration	[1]		$ (6,306,000)	$ 7,732,000	$ (5,939,000)	$ 17,630,000
Acquisition related costs			$ 190,000	$ 456,000	$ 536,000	10,446,000
Acquisition of ETFS Business [Member]
Gain on revaluation of deferred consideration						$ 4,670,000
Business acquisition, cash paid		$ 253,000,000
Business acquisition, number of shares to be issued		30,000,000
Business acquisition, number of common shares that the preferred stock is convertible into		14,750,000
Acquisition of ETFS Business [Member] | Term Loan Facility [Member]
Borrowing under term loan facility		$ 200,000,000
Acquisition of ETFS Business [Member] | Revolving Credit Facility [Member]
Revolving credit facility maximum borrowing capacity		$ 50,000,000
Acquisition of ETFS Business [Member] | Common Stock [Member]
Business acquisition, number of shares to be issued		15,250,000
Series A Non-Voting Convertible Preferred Stock [Member] | Acquisition of ETFS Business [Member]
Business acquisition, number of shares to be issued		14,750
[1] Gains/(losses) arise due to (decreases)/increases in the forward-looking price of gold and the magnitude of any gain or loss is highly correlated to the magnitude of the change in the forward-looking price of gold. See Note 5 for a reconciliation of changes in the deferred consideration balances.

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