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Organizational and Description of Business - Additional Information (Detail) - Acquisition of ETFS Business [Member] - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Nov. 13, 2017 | Mar. 31, 2018 | Apr. 11, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |
Acquisition completion date |  | Apr. 11, 2018 |
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 common shares that the preferred stock is convertible into | 14,750,000 |  |
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 |  |
Revolving Credit Facility [Member] |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |
Revolving credit facility maximum borrowing capacity |  |  | $ 50,000,000
Term Loan Facility [Member] |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |
Borrowing under term loan facility |  |  | $ 200,000,000
Common Stock [Member] |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |
Business acquisition, number of shares to be issued | 15,250,000 |  |

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