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Related Party Transactions - Schedule of Activity and Outstanding Balances Between Managed Investment Products and Company (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Unrealized gain (loss) on investment | $ 2,560 | $ (826) | $ 658 | $ (1,809) |
Managed Investment Products |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Investment management revenues receivable | 751 |  | 751 |  | $ 746
Receivable for reimbursable expenses paid | 185 |  | 185 |  | 158
GECC | Managed Investment Products |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Unrealized gain (loss) on investment | 2,560 | (826) | 658 | (1,809) |
Dividend income from GECC | 1,322 | $ 588 | 1,846 | $ 1,078 |
Dividends receivable from GECC | $ 450 |  | $ 450 |  | $ 170

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