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Long-Term Debt - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 11, 2018 | Jun. 30, 2018 | Jun. 30, 2018
Debt Instrument [Line Items] |  |  |
Proceeds from term loan |  |  | $ 200,000,000
Interest expense |  | $ 2,356,000 | 2,356,000
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized issuance costs |  | $ 1,460,000 | $ 1,460,000
Acquisition of ETFS Business [Member] | Term Loan Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from term loan | $ 200,000,000 |  |
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
Acquisition of ETFS Business [Member] | Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 1.75% |  |
Acquisition of ETFS Business [Member] | Term Loan Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 2.00% |  |
Acquisition of ETFS Business [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [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 |  |
Debt instrument, facility fee rate | 0.50% |  |
Acquisition of ETFS Business [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 1.25% |  |
Acquisition of ETFS Business [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 1.50% |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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