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

X

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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X

- 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- References

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- Definition

Gain/loss from revaluation of deferred consideration.

+ References

No definition available.

+ Details

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