Revenue - Summary of Commissions Receivable Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Contract with Customer, Asset [Roll Forward]
Commission revenue	$ 158,654	$ 196,902	$ 429,247	$ 401,081
Less: Commissions receivable - current	198,647		198,647		$ 268,663
Commissions receivable - non-current	961,999		961,999		$ 993,844
Commission
Contract with Customer, Asset [Roll Forward]
Beginning balance			1,262,507	809,859
Commission revenue	118,038	147,508	327,677	321,489
Cash receipts			(429,605)	(257,814)
Allowance for credit loss			67	(42)
Ending balance	1,160,646	873,492	1,160,646	873,492
Less: Commissions receivable - current	198,647	113,062	198,647	113,062
Commissions receivable - non-current	$ 961,999	$ 760,430	$ 961,999	$ 760,430