v3.25.4

RELATED PARTY TRANSACTIONS - (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 renewal_option	Dec. 31, 2025 USD ($) renewal_option	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Total revenue		$ 2,530,234	$ 2,109,054	$ 1,885,842
Advanced billings		854,390	710,585
Accounts receivable and unbilled, net		402,078	296,443
Other current liabilities		52,834	53,633
Prepaid expense and other assets, current		90,497	63,350
Operating lease cost recognized		31,057	31,593	$ 27,919
Operating lease right-of-use assets		117,815	128,649
Current portion of lease liability		23,209	23,289
Long-term portion of lease liabilities		113,643	126,234
Accounts payable		$ 28,142	$ 32,528
United States | Revenue net | Geographical Locations
Related Party Transaction [Line Items]
Percentage of total revenue to consolidated total revenue		99.00%	98.00%	98.00%
Related Party
Related Party Transaction [Line Items]
Total revenue		$ 53,200	$ 50,000	$ 59,600
Advanced billings		12,300	14,600
Accounts receivable and unbilled, net		3,500	4,200
Operating lease right-of-use assets		68,416	74,889
Current portion of lease liability		6,915	6,310
Long-term portion of lease liabilities		77,344	84,259
Accounts payable		300	200
Employee Loans | Related Party
Related Party Transaction [Line Items]
Prepaid expenses, other current assets, and other assets		400	300
Related Party Service Agreement | Related Party | LIB
Related Party Transaction [Line Items]
Advanced billings		8,100	9,500
Accounts receivable and unbilled, net		1,900	2,800
Related Party Service Agreement | Related Party | CinRx Pharma and Subsidiaries
Related Party Transaction [Line Items]
Advanced billings		4,300	5,200
Accounts receivable and unbilled, net		1,600	1,400
Related Party Service Agreement | Related Party | The Summit Hotel
Related Party Transaction [Line Items]
Operating costs and expenses		300	300	400
Related Party Service Agreement | Related Party | Revenue net | LIB
Related Party Transaction [Line Items]
Total revenue		7,900	21,700	43,700
Related Party Service Agreement | Related Party | Revenue net | CinRx Pharma and Subsidiaries
Related Party Transaction [Line Items]
Total revenue		$ 45,300	28,300	15,800
Leased Real Estate | Related Party | Office Space | Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Number of lease renewal, 10-year option | renewal_option		2
Lease term upon renewal		10 years
Operating lease right-of-use assets		$ 48,400	50,200
Current portion of lease liability		1,800	1,500
Long-term portion of lease liabilities		$ 60,200	62,000
Leased Real Estate | Related Party | Building | Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Number of lease renewal, 10-year option | renewal_option		1
Lease term upon renewal		10 years
Operating lease right-of-use assets		$ 4,200	6,400
Current portion of lease liability		2,300	2,200
Long-term portion of lease liabilities		1,900	4,200
Leased Real Estate | Related Party | Direct Costs and Selling General And Administrative | Office Space | Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Operating lease cost recognized		5,700	5,700	5,700
Leased Real Estate | Related Party | Direct Costs and Selling General And Administrative | Building | Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Operating lease cost recognized		2,500	2,500	2,500
Leased Real Estate | Chief Executive Officer
Related Party Transaction [Line Items]
Term of lease	10 years
Number of lease renewal, 10-year option | renewal_option	1
Lease term upon renewal	10 years
Operating lease right-of-use assets		15,800	17,600
Current portion of lease liability		1,800	1,600
Long-term portion of lease liabilities		14,700	16,500
Leased Real Estate | Chief Executive Officer | Direct Costs and Selling General And Administrative
Related Party Transaction [Line Items]
Operating lease cost recognized		2,700	2,700	2,600
Travel Services | Related Party
Related Party Transaction [Line Items]
Accounts payable		300	200
Travel Services | Chief Executive Officer | Selling, general, and administrative
Related Party Transaction [Line Items]
Travel expenses with related party		$ 2,100	1,900	2,000
Second Leased Real Estate | Related Party | Building | Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Number of lease renewal, 10-year option | renewal_option		1
Lease term upon renewal		10 years
Operating lease right-of-use assets		$ 0	700
Current portion of lease liability		1,000	900
Long-term portion of lease liabilities		500	1,500
Second Leased Real Estate | Related Party | Direct Costs and Selling General And Administrative | Building | Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Operating lease cost recognized		$ 800	$ 2,900	$ 1,100

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