Segment Information Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 1,699,143	$ 1,521,805	$ 1,398,755
Revenues before reimbursable expenses	1,662,836	1,486,085	1,362,060
Consulting And Managed Services Capability
Disaggregation of Revenue [Line Items]
Revenues	998,306	885,485	804,543
Revenues before reimbursable expenses	976,883	863,859	782,020
Digital Capability
Disaggregation of Revenue [Line Items]
Revenues	700,837	636,320	594,212
Revenues before reimbursable expenses	685,953	622,226	580,040
Healthcare
Disaggregation of Revenue [Line Items]
Revenues	858,422	777,437	696,313
Revenues before reimbursable expenses	837,537	756,263	673,989
Healthcare | Consulting And Managed Services Capability
Disaggregation of Revenue [Line Items]
Revenues	638,414	549,686	493,263
Revenues before reimbursable expenses	622,637	533,846	476,726
Healthcare | Digital Capability
Disaggregation of Revenue [Line Items]
Revenues	220,008	227,751	203,050
Revenues before reimbursable expenses	214,900	222,417	197,263
Education [Member]
Disaggregation of Revenue [Line Items]
Revenues	509,509	483,541	438,892
Revenues before reimbursable expenses	500,174	474,221	429,663
Education [Member] | Consulting And Managed Services Capability
Disaggregation of Revenue [Line Items]
Revenues	261,564	245,358	219,098
Revenues before reimbursable expenses	256,913	240,985	214,971
Education [Member] | Digital Capability
Disaggregation of Revenue [Line Items]
Revenues	247,945	238,183	219,794
Revenues before reimbursable expenses	243,261	233,236	214,692
Commercial
Disaggregation of Revenue [Line Items]
Revenues	331,212	260,827	263,550
Revenues before reimbursable expenses	325,125	255,601	258,408
Commercial | Consulting And Managed Services Capability
Disaggregation of Revenue [Line Items]
Revenues	98,328	90,441	92,182
Revenues before reimbursable expenses	97,333	89,028	90,323
Commercial | Digital Capability
Disaggregation of Revenue [Line Items]
Revenues	232,884	170,386	171,368
Revenues before reimbursable expenses	$ 227,792	$ 166,573	$ 168,085