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Business Combination - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 11, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Acquisition related costs |  | $ 7,928,000 |  | $ 9,990,000 |
Gain (loss) on revaluation of deferred consideration |  | 9,898,000 |  | 9,898,000 |
Acquisition of ETFS Business [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Business acquisition, cash paid | $ 253,000,000 |  |  |  |
Cash consideration paid from proceeds arising from maturities of securities owned, at fair value | $ 53,000,000 |  |  |  |
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 related costs |  | 7,928,000 |  | 9,990,000 |
Gain (loss) on revaluation of deferred consideration |  | 8,326,000 | $ 319,000 | 5,771,000 | $ (8,039,000)
Acquisition of ETFS Business [Member] | Term Loan Facility [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Borrowing under term loan facility | $ 200,000,000 |  |  |  |
Acquisition of ETFS Business [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Revolving credit facility maximum borrowing capacity | $ 50,000,000 |  |  |  |
Acquisition of ETFS Business [Member] | Series A Non-Voting Convertible Preferred Stock [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Business acquisition, number of shares to be issued | 14,750 |  |  |  |
Acquisition of ETFS Business [Member] | Common Stock [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Business acquisition, number of shares to be issued | 15,250,000 |  |  |  |
ETFS Capital Limited [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Payable to ETFS Capital Limited |  | $ 7,033,000 |  | $ 7,033,000 |

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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