Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables And Accruals [Abstract]
Accrued incentive compensation	$ 159,356	$ 144,475
Accrued compensation and benefits	41,550	60,260
Lease liability	43,542	43,415
Deferred revenue	53,956	41,180
Reserve for policy cancellations	31,081	18,353
Accrued interest	15,260	10,984
Accrued rent and vendor expenses	6,682	7,422
Other	20,310	11,628
Total	$ 371,737	$ 337,717