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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jul. 12, 2018 | Sep. 30, 2018 | Aug. 07, 2018
Common Class A | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Dividends payable (in dollars per share) |  |  | $ 0.2125
Revolving Loan Agreement | Revolving Credit Facility | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Repayments of long-term debt | $ 10,450 |  |
Scenario, Forecast |  |  |
Subsequent Event [Line Items] |  |  |
Expected realized gain on other investment |  | $ 7,600 |

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal 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 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + 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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