Acquisitions - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Oct. 01, 2021	Dec. 31, 2021	Dec. 31, 2021	Feb. 01, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 338,406	$ 338,406		$ 290,366	$ 290,366	$ 290,366
Contingent consideration		162,564	$ 162,564		$ 0
AllianzGI
Business Acquisition [Line Items]
Goodwill				$ 25,000
Asset acquisition, annual payment term			7 years
Asset acquisition, contingent consideration, liability		150,100	$ 150,100	$ 137,700
Capitalized contract costs		7,700	7,700
Westchester
Business Acquisition [Line Items]
Purchase price	$ 169,300
Goodwill	23,040
Intangible assets	144,400
Business acquisition, goodwill, expected tax deductible amount	$ 155,600
Goodwill and other intangible assets, amount expected to be tax deductible	15 years
Payments to acquire businesses, gross	$ 136,800	20,000
Contingent consideration	$ 32,500	$ 12,500	$ 12,500