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RELATED PARTY TRANSACTIONS - (Details) $ in Thousands	3 Months Ended	12 Months Ended
RELATED PARTY TRANSACTIONS - (Details) $ in Thousands	Mar. 31, 2023 renewal_option	Dec. 31, 2023 USD ($) renewal_option building Agreement	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Total revenue		$ 1,885,842	$ 1,459,996	$ 1,142,377
Advanced billings		559,860	462,729
Accounts receivable and unbilled, net		298,400	253,404
Other current liabilities		40,441	47,547
Prepaid expense and other assets, current		49,979	52,293
Operating lease cost recognized		27,919	25,874	23,873
Operating lease right-of-use assets		144,801	139,068
Current portion of lease liability		22,365	19,272
Long-term portion of lease liabilities		142,122	138,867
Accounts payable		31,869	33,069
Related Party
Related Party Transaction [Line Items]
Total revenue		59,600	55,400	34,500
Advanced billings		10,100	8,800
Accounts receivable and unbilled, net		2,400	7,700
Other current liabilities			12,500
Prepaid expense and other assets, current		300
Operating lease right-of-use assets		83,065	86,356
Current portion of lease liability		5,730	5,409
Long-term portion of lease liabilities		90,568	93,393
Accounts payable		3,100	300
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		7,600	7,400
Accounts receivable and unbilled, net		500	5,500
Other current liabilities			12,500
Related Party Service Agreement \| Related Party \| CinRx Pharma and Subsidiaries
Related Party Transaction [Line Items]
Advanced billings		2,500	1,400
Accounts receivable and unbilled, net		1,900	2,200
Prepaid expense and other assets, current		200
Related Party Service Agreement \| Related Party \| The Summit Hotel
Related Party Transaction [Line Items]
Operating costs and expenses		400	300	300
Related Party Service Agreement \| Related Party \| Revenue net \| LIB
Related Party Transaction [Line Items]
Total revenue		43,700	40,500	11,800
Related Party Service Agreement \| Related Party \| Revenue net \| CinRx Pharma and Subsidiaries
Related Party Transaction [Line Items]
Total revenue		$ 15,800	15,000	22,700
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		$ 51,900	53,500
Current portion of lease liability		1,300	1,100
Long-term portion of lease liabilities		$ 63,500	64,800
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		$ 11,900	14,600
Current portion of lease liability		3,000	2,800
Long-term portion of lease liabilities		$ 8,900	11,900
Number of lease agreements \| Agreement		2
Number of buildings \| building		2
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		3,600	3,600	3,600
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		19,300	18,200
Current portion of lease liability		1,500	1,500
Long-term portion of lease liabilities		18,100	16,700
Leased Real Estate \| Chief Executive Officer \| Direct Costs and Selling General And Administrative
Related Party Transaction [Line Items]
Operating lease cost recognized		2,600	2,300	2,100
Travel Services \| Related Party
Related Party Transaction [Line Items]
Accounts payable		400	300
Travel Services \| Chief Executive Officer
Related Party Transaction [Line Items]
Travel expenses with related party		$ 2,000	$ 2,300	$ 1,300