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Business Combination - Summary of Operating Results of ETFS since the Acquisition Date (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Combinations [Abstract]
Revenues					$ 37,137
Income before taxes					33,496
Gain on revaluation of deferred consideration	[1]	$ (6,306)	$ 7,732	$ (5,939)	$ 17,630
[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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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Gain/loss from revaluation of deferred consideration.

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