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Revenue - Disaggregation of Revenue (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
Disaggregation of Revenue [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
Management and advisory fees
Disaggregation of Revenue [Line Items]
Revenues									244,920	217,773	195,030
Specialized funds
Disaggregation of Revenue [Line Items]
Revenues									90,750	85,245	79,275
Customized separate accounts
Disaggregation of Revenue [Line Items]
Revenues									111,803	93,056	83,151
Advisory
Disaggregation of Revenue [Line Items]
Revenues									24,160	24,130	20,164
Reporting and other
Disaggregation of Revenue [Line Items]
Revenues									9,102	8,805	8,064
Distribution management
Disaggregation of Revenue [Line Items]
Revenues									4,920	4,525	4,376
Fund reimbursement revenue
Disaggregation of Revenue [Line Items]
Revenues									4,185	2,012	0
Incentive fees
Disaggregation of Revenue [Line Items]
Revenues									29,128	34,406	49,003
Specialized funds
Disaggregation of Revenue [Line Items]
Revenues									14,371	25,687	43,902
Customized separate accounts
Disaggregation of Revenue [Line Items]
Revenues									$ 14,757	$ 8,719	$ 5,101

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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