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v3.8.0.1

Subsequent Events - Senior Secured Debt Financing - Additional Information (Detail) - Acquisition of ETFS Business [Member] - USD ($) |  | 3 Months Ended
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Apr. 11, 2018 | Mar. 31, 2018
Term Loan Facility [Member] |  |
Subsequent Event [Line Items] |  |
Debt instrument, interest rate |  | Interest on the Term Loan accrues at a rate per annum equal to LIBOR, plus up to 2.00% (commencing at LIBOR, plus 1.75%)
Debt instrument, variable rate basis |  | LIBOR
Revolving Credit Facility [Member] |  |
Subsequent Event [Line Items] |  |
Debt instrument, interest rate |  | Revolver accrues at a rate per annum equal to LIBOR, plus up to 1.50% (commencing at LIBOR, plus 1.25%)
Revolving credit facility maximum borrowing capacity | $ 50,000,000 |
Subsequent Event [Member] | Term Loan Facility [Member] |  |
Subsequent Event [Line Items] |  |
Proceeds from term loan | $ 200,000,000 |
Subsequent Event [Member] | Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Subsequent Event [Line Items] |  |
Debt instrument, interest rate | 1.75% |
Subsequent Event [Member] | Term Loan Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Subsequent Event [Line Items] |  |
Debt instrument, interest rate | 2.00% |
Subsequent Event [Member] | Revolving Credit Facility [Member] |  |
Subsequent Event [Line Items] |  |
Revolving credit facility maximum borrowing capacity | $ 50,000,000 |
Debt instrument, facility fee rate | 0.50% |
Subsequent Event [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Subsequent Event [Line Items] |  |
Debt instrument, interest rate | 1.25% |
Subsequent Event [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Subsequent Event [Line Items] |  |
Debt instrument, interest rate | 1.50% |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition 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. + References No definition available. + Details
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