Revenue and Related Matters - Schedule of Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets:
Fees receivable, gross	$ 1,371,680	$ 1,251,508
Contract assets recorded in Prepaid expenses and other current assets	20,054	14,440
Contract liabilities:
Deferred revenues (current liability)	2,238,035	1,974,548
Non-current deferred revenues recorded in Other liabilities	48,176	26,754
Total contract liabilities	$ 2,286,211	$ 2,001,302