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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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Previously Deferred Incentive Fees, Revenue Recognized In Current Period, Percent

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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