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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 63,362 | $ 52,701
Customized separate accounts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 20,387 | 18,784
Specialized funds |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 21,015 | 25,206
Advisory and reporting |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 8,159 | 6,650
Distribution management |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,088 | 1,044
Fund reimbursement revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 330 | 0
Management and advisory fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 50,979 | $ 51,684

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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