Fair Value Measurements - Carrying Amount and Estimated Fair Value of Financial Instrument Assets and Liabilities which are Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Level 1
Financial Assets:
Cash and Cash Equivalents	$ 542,879	$ 863,078
Certificates of Deposit	0	0
Receivables	0	0
Contract Assets	0	0
Closely-held Equity Securities	0	0
Financial Liabilities:
Accounts Payable and Accrued Expenses	0	0
Payable to Employees and Related Parties	0	0
Notes Payable	0	0
Level 2
Financial Assets:
Cash and Cash Equivalents	0	0
Certificates of Deposit	16,816	66,660
Receivables	577,990	518,485
Contract Assets	47,482	76,184
Closely-held Equity Securities	0	0
Financial Liabilities:
Accounts Payable and Accrued Expenses	41,375	29,041
Payable to Employees and Related Parties	86,295	48,494
Notes Payable	360,596	356,531
Level 3
Financial Assets:
Cash and Cash Equivalents	0	0
Certificates of Deposit	0	0
Receivables	0	0
Contract Assets	0	0
Closely-held Equity Securities	645	625
Financial Liabilities:
Accounts Payable and Accrued Expenses	0	0
Payable to Employees and Related Parties	0	0
Notes Payable	0	0
Carrying Amount
Financial Assets:
Cash and Cash Equivalents	542,879	863,078
Certificates of Deposit	16,816	66,660
Receivables	582,613	522,816
Contract Assets	48,200	76,856
Closely-held Equity Securities	645	625
Financial Liabilities:
Accounts Payable and Accrued Expenses	41,375	29,041
Payable to Employees and Related Parties	86,295	48,494
Notes Payable	375,055	373,895
Total
Financial Assets:
Cash and Cash Equivalents	542,879	863,078
Certificates of Deposit	16,816	66,660
Receivables	577,990	518,485
Contract Assets	47,482	76,184
Closely-held Equity Securities	645	625
Financial Liabilities:
Accounts Payable and Accrued Expenses	41,375	29,041
Payable to Employees and Related Parties	86,295	48,494
Notes Payable	$ 360,596	$ 356,531