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Subsequent Events - Preliminary Purchase Price Allocation - Additional Information (Detail) - Acquisition of ETFS Business [Member] - USD ($) $ in Thousands			3 Months Ended
	Apr. 11, 2018	Nov. 13, 2017	Mar. 31, 2018
Subsequent Event [Line Items]
Business acquisition effective date			Apr. 11, 2018
Cash consideration paid from proceeds arising from maturities of securities owned, at fair value		$ 53,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Business acquisition effective date	Apr. 11, 2018
Payments to acquire business, gross	$ 253,000
Cash consideration paid from proceeds arising from maturities of securities owned, at fair value	$ 53,000
Shares issued in Business acquisition	30,000,000
Purchase price financed through Term Loan	$ 200,000
Subsequent Event [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Shares issued in Business acquisition	15,250,000
Common stock equivalents	14,750,000
Subsequent Event [Member] | Preferred Stock [Member]
Subsequent Event [Line Items]
Shares issued in Business acquisition	14,750

X

- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e845-128460

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Number of shares of equity interests issued or issuable to acquire entity.

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-SubTopic 30
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- Definition

Number of shares issued for each share of convertible preferred stock that is converted.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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- Definition

Cash consideration paid from proceeds arising from maturities of securities owned, at fair value.

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Term loan to acquire business gross.

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