Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
New Accounting Pronouncements or Change in Accounting Principle
Provision (reversal) for expected credit losses	$ 2,000,000	$ 100,000	$ 3,500,000	$ 1,300,000
Guaranty liabilities	29,790,000		29,790,000		$ 26,315,000	$ 28,551,000
Allowance for doubtful accounts, period increase (decrease)	1,200,000	100,000	(800,000)	1,800,000
Allowance for doubtful accounts	13,600,000		13,600,000		14,400,000
Allowance for credit loss	8,800,000		$ 8,800,000		8,800,000
Number of reportable segments | segment			1
Revenues	759,112,000	633,375,000	$ 1,424,606,000	1,179,874,000
Interest income on loans held for sale	8,991,000	5,933,000	17,298,000	12,815,000
Labor and related expense	515,184,000	403,009,000	989,042,000	782,646,000
Equity-based compensation and allocations of net income to limited partnership units and FPUs	60,140,000	25,486,000	134,486,000	76,929,000
Depreciation and amortization	42,611,000	40,879,000	88,969,000	84,854,000
Professional and consulting fees	7,794,000	6,668,000	17,364,000	14,209,000
Interest expense, net	(9,023,000)	(8,258,000)	(17,506,000)	(15,478,000)
Other income (loss), net	230,000	5,637,000	980,000	5,623,000
Total assets	5,389,959,000		5,389,959,000		$ 4,710,120,000
Reportable Segment
New Accounting Pronouncements or Change in Accounting Principle
Revenues	759,100,000	633,400,000	1,424,600,000	1,179,900,000
Interest income on loans held for sale	9,000,000.0	5,900,000	17,300,000	12,800,000
Labor and related expense	515,200,000	403,000,000	989,000,000	782,600,000
Equity-based compensation and allocations of net income to limited partnership units and FPUs	60,100,000	25,500,000	134,500,000	76,900,000
Operating expenses	201,400,000	195,300,000	411,300,000	384,700,000
Depreciation and amortization	42,600,000	40,900,000	89,000,000	84,900,000
Professional and consulting fees	7,800,000	6,700,000	17,400,000	14,200,000
Interest expense, net	9,000,000	8,300,000	17,500,000	15,500,000
Other income (loss), net	$ 230,000.0	$ 5,600,000	$ 1,000,000	$ 5,600,000