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Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Unbilled service fees		$ 137,938	$ 30,570
Unbilled outside vendor costs, billable to clients		37,101	11,063
Advance billings		286,790	66,418
Increase (Decrease) in Contract with Customer, Liability		220,372
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination		211,687
Contract with Customer, Liability, Revenue Recognized	$ 9,311	45,432
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount		$ 8,498
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		1 year
Revenue, Remaining Performance Obligation, Percentage		35.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		1 year
Revenue, Remaining Performance Obligation, Percentage		60.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Percentage		4.00%
Accrued Expenses and Other Current Liabilities
Disaggregation of Revenue [Line Items]
Advance billings		$ 168,882	$ 9,311
Increase (Decrease) in Contract with Customer, Liability		159,571
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination		$ 108,488

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Gross amount of merchandise or goods which are partially completed, are generally comprised of raw materials, labor and factory overhead costs, and which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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