Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 358,178	$ 285,370	$ 1,022,832	$ 818,744
Consulting And Managed Services Capability [Member]
Disaggregation of Revenue [Line Items]
Revenues	214,688	155,901	589,137	454,356
Digital Capability [Member]
Disaggregation of Revenue [Line Items]
Revenues	143,490	129,469	433,695	364,388
Healthcare
Disaggregation of Revenue [Line Items]
Revenues	179,177	131,319	501,994	381,669
Healthcare | Consulting And Managed Services Capability [Member]
Disaggregation of Revenue [Line Items]
Revenues	130,548	88,626	357,228	256,340
Healthcare | Digital Capability [Member]
Disaggregation of Revenue [Line Items]
Revenues	48,629	42,693	144,766	125,329
Education
Disaggregation of Revenue [Line Items]
Revenues	111,043	94,347	325,884	263,234
Education | Consulting And Managed Services Capability [Member]
Disaggregation of Revenue [Line Items]
Revenues	55,837	49,363	162,490	142,823
Education | Digital Capability [Member]
Disaggregation of Revenue [Line Items]
Revenues	55,206	44,984	163,394	120,411
Commercial:
Disaggregation of Revenue [Line Items]
Revenues	67,958	59,704	194,954	173,841
Commercial: | Consulting And Managed Services Capability [Member]
Disaggregation of Revenue [Line Items]
Revenues	28,303	17,912	69,419	55,193
Commercial: | Digital Capability [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 39,655	$ 41,792	$ 125,535	$ 118,648