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Summary of Significant Accounting Policies - Revenue by Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 76,932 | $ 68,138 | $ 64,292 | $ 64,686 | $ 66,988 | $ 65,996 | $ 55,833 | $ 63,362 | $ 274,048 | $ 252,179 | $ 244,033
Percent of total revenues recognized previously recorded as deferred incentive fees |  |  |  |  |  |  |  |  |  |  | 17.00%
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 134,347 | 132,326 | $ 130,737
Other foreign countries |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 139,701 | $ 119,853 | $ 113,296

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