Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Oct. 01, 2023	Jan. 23, 2023
Business Acquisition [Line Items]
Goodwill	$ 1,923,146	$ 1,880,244
RPS Group PLC
Business Acquisition [Line Items]
Cash and cash equivalents			$ 32,093
Accounts receivable and contract assets			202,303
Prepaid expenses and other current assets			45,999
Income taxes receivables			1,999
Property and equipment			38,435
Right-of-use assets, operating leases			40,179
Intangible assets			174,094
Deferred income taxes			35,084
Other long-term assets			1,061
Total assets acquired			571,247
Accounts payable			(44,376)
Accrued compensation			(19,073)
Contract liabilities			(46,287)
Income tax payable			(7,083)
Short-term lease liabilities, operating leases			(13,477)
Other current liabilities			(135,474)
Current portion of long-term debt			(91,973)
Long-term lease liabilities, operating leases			(26,702)
Other long-term liabilities			(13,742)
Deferred tax liabilities			(41,613)
Total liabilities assumed			(439,800)
Fair value of net assets acquired			131,447
Goodwill			652,762
Total purchase consideration			$ 784,209