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Compensation and Benefits - Schedule of Compensation and Benefits (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Compensation Related Costs [Abstract]
Base compensation and benefits	$ 84,144		$ 78,452	$ 72,151
Incentive fee compensation	7,192		7,785	1,774
Equity-based compensation	7,183		6,382	5,544
Contingent compensation related to acquisition (Note 7)	0		5,100	3,399
Total compensation and benefits	$ 98,519	$ 98,519	$ 97,719	$ 82,868

X

- Definition

Business Combination, Contingent Compensation

+ References

No definition available.

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- Definition

Incentive Fee Compensation Expense

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No definition available.

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X

- Definition

Salaries, Wages And Officers' Compensation And Employee Benefits

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section S99
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- References

No definition available.

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- Definition

Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(4))
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