Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets
Allowance for expected credit losses	$ 15,196	$ 13,446
Accrued vacation and bonus	47,793	51,045
Share-based compensation	16,305	15,081
Notes receivable from employees	25,309	16,046
Foreign net operating and capital loss carryforward	31,762	20,411
Foreign tax credit carryforward	33,863	25,963
Deferred compensation	3,728	3,636
Operating lease assets	64,515	58,982
Other, net	7,243	6,773
Total deferred tax assets	245,714	211,383
Deferred tax liabilities
Revenue recognition	(3,461)	(2,833)
Operating lease liabilities	(49,134)	(47,923)
Property and equipment, net	(13,478)	(9,831)
Goodwill and intangible assets	(218,610)	(212,595)
Total deferred tax liabilities	(284,683)	(273,182)
Foreign withholding tax	(1,363)	(1,538)
Valuation allowance	(24,481)	(9,612)
Net deferred tax liabilities	$ (64,813)	$ (72,949)