Related Party Transactions - Citco (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Net additional subscriptions		$ 796,918	$ 901,071	$ 109,885
Investments in funds		2,524,420	1,957,757
Affiliated entity
Related Party Transaction [Line Items]
Investments in funds		$ 1,741,400
Citco | Trident | Affiliated entity
Related Party Transaction [Line Items]
Net additional subscriptions	$ 50,000
Voting ordinary shares acquired, percent		3.40%
Citco
Related Party Transaction [Line Items]
Investments in funds		$ 51,742	$ 50,812