Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
New Accounting Pronouncements or Change in Accounting Principle
Provision (reversal) for expected credit losses	$ 1,500	$ 1,500
Guaranty liabilities	32,070		$ 30,610	$ 26,315
Allowance for doubtful accounts, period increase (decrease)	(100)	(2,000)
Allowance for doubtful accounts	7,300		7,400
Allowance for credit loss	8,800		8,800
Other income (loss), net	$ 644	750
Number of reportable segments | segment	1
Revenues	$ 846,519	665,494
Interest income on loans held for sale	11,285	8,307
Labor and related expense	584,003	473,858
Equity-based compensation and allocations of net income to limited partnership units and FPUs	68,396	74,346
Depreciation and amortization	46,232	46,358
Professional and consulting fees	8,524	9,570
Interest expense, net	6,914	8,483
Total assets	5,279,057		$ 5,019,167
Reportable Segment
New Accounting Pronouncements or Change in Accounting Principle
Other income (loss), net	600	800
Revenues	846,500	665,500
Interest income on loans held for sale	11,300	8,300
Labor and related expense	584,000	473,900
Equity-based compensation and allocations of net income to limited partnership units and FPUs	68,400	74,300
Operating expenses	236,200	209,900
Depreciation and amortization	46,200	46,400
Professional and consulting fees	8,500	9,600
Interest expense, net	$ (6,900)	$ (8,500)