Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jan. 02, 2024	Dec. 31, 2023	Apr. 25, 2023
Business Acquisition [Line Items]
Advance billings	$ (8,800)
Goodwill	(1,521,005)		$ (1,498,815)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current, Expenditures Billables	$ 5,500
Huskies [Member]
Business Acquisition [Line Items]
Goodwill				$ (2,600)
Team Epiphany
Business Acquisition [Line Items]
Cash and cash equivalents		$ 1,095
Accounts receivable		8,677
Other current assets		402
Fixed assets		184
Right-of-use lease assets - operating leases		2,788
Identifiable intangible assets		(4,316)
Accounts payable		(1,086)
Accruals and other liabilities		(664)
Advance billings		(8,808)
Current portion of lease liabilities		(516)
Net liabilities assumed		(8,611)
Goodwill		(7,237)
Purchase price consideration		15,848
Long-term portion of lease liabilities		(2,600)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current, Expenditures Billables		$ 4,823