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Organizational and Description of Business - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Nov. 13, 2017 | Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Business acquisition, cash paid |  | $ 2,132,000
ETFS Pending Acquisition Business [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Business acquisition, cash paid | $ 253,000,000 |
Consideration to be paid from cash on hand | $ 53,000,000 |
Business acquisition, number of common shares that the preferred stock is convertible into | 14,750,000 |
Debt instrument, interest rate |  | Credit facilities will accrue at a rate per annum of up to LIBOR plus 2.00% (commencing at LIBOR plus 1.75%) or up to ABR plus 1.00% (commencing at ABR plus 0.75%), subject to step-downs based on our ratio of debt to adjusted earnings before
ETFS Pending Acquisition Business [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Debt instrument, Variable rate basis |  | LIBOR
Debt instrument, interest rate | 1.75% |
ETFS Pending Acquisition Business [Member] | Alternate Base Rate [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Debt instrument, Variable rate basis |  | ABR
Debt instrument, interest rate | 0.75% |
ETFS Pending Acquisition Business [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Debt instrument, interest rate | 2.00% |
ETFS Pending Acquisition Business [Member] | Maximum [Member] | Alternate Base Rate [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Debt instrument, interest rate | 1.00% |
ETFS Pending Acquisition 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 |
ETFS Pending Acquisition Business [Member] | Secured Debt [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Committed senior secured debt financing | $ 250,000,000 |
ETFS Pending Acquisition Business [Member] | Revolving Credit Facility [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Revolving credit facility maximum borrowing capacity | $ 50,000,000 |
Commitment fee percentage | 0.50% |
ETFS Pending Acquisition Business [Member] | Term Loan Facility [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Borrowing under term loan facility | $ 200,000,000 |
ETFS Pending Acquisition 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 |

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