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RELATED PARTY TRANSACTIONS - (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023 renewal_option	Dec. 31, 2024 USD ($) renewal_option	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Total revenue		$ 2,109,054	$ 1,885,842	$ 1,459,996
Advanced billings		710,585	559,860
Accounts receivable and unbilled, net		296,443	298,400
Other current liabilities		53,633	40,441
Prepaid expense and other assets, current		63,350	49,979
Operating lease cost recognized		31,593	27,919	$ 25,874
Operating lease right-of-use assets		128,649	144,801
Current portion of lease liability		23,289	22,365
Long-term portion of lease liabilities		126,234	142,122
Accounts payable		$ 32,528	$ 31,869
United States | Revenue net | Geographical Locations
Related Party Transaction [Line Items]
Percentage of total revenue to consolidated total revenue		98.00%	98.00%	98.00%
Related Party
Related Party Transaction [Line Items]
Total revenue		$ 50,000	$ 59,600	$ 55,400
Advanced billings		14,600	10,100
Accounts receivable and unbilled, net		4,200	2,400
Prepaid expense and other assets, current		100	300
Operating lease right-of-use assets		74,889	83,065
Current portion of lease liability		6,310	5,730
Long-term portion of lease liabilities		84,259	90,568
Accounts payable		200	3,100
Employee Loans | Related Party
Related Party Transaction [Line Items]
Prepaid expenses, other current assets, and other assets		300	300
Related Party Service Agreement | Related Party | LIB
Related Party Transaction [Line Items]
Advanced billings		9,500	7,600
Accounts receivable and unbilled, net		2,800	500
Related Party Service Agreement | Related Party | CinRx Pharma and Subsidiaries
Related Party Transaction [Line Items]
Advanced billings		5,200	2,500
Accounts receivable and unbilled, net		1,400	1,900
Prepaid expense and other assets, current		100	200
Related Party Service Agreement | Related Party | The Summit Hotel
Related Party Transaction [Line Items]
Operating costs and expenses		300	400	300
Related Party Service Agreement | Related Party | Revenue net | LIB
Related Party Transaction [Line Items]
Total revenue		21,700	43,700	40,500
Related Party Service Agreement | Related Party | Revenue net | CinRx Pharma and Subsidiaries
Related Party Transaction [Line Items]
Total revenue		$ 28,300	15,800	15,000
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		$ 50,200	51,900
Current portion of lease liability		1,500	1,300
Long-term portion of lease liabilities		$ 62,000	63,500
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		$ 6,400	8,500
Current portion of lease liability		2,200	2,100
Long-term portion of lease liabilities		4,200	6,400
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		17,600	19,300
Current portion of lease liability		1,600	1,500
Long-term portion of lease liabilities		16,500	18,100
Leased Real Estate | Chief Executive Officer | Direct Costs and Selling General And Administrative
Related Party Transaction [Line Items]
Operating lease cost recognized		2,700	2,600	2,300
Travel Services | Related Party
Related Party Transaction [Line Items]
Accounts payable		200	400
Travel Services | Chief Executive Officer | Selling, general, and administrative
Related Party Transaction [Line Items]
Travel expenses with related party		$ 1,900	2,000	2,300
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		$ 700	3,400
Current portion of lease liability		900	900
Long-term portion of lease liabilities		1,500	2,500
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		$ 2,900	$ 1,100	$ 1,100

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