CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Revenues	$ 1,353,443	$ 1,146,597	$ 2,655,135	$ 2,312,062
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	964,012	810,857	1,916,020	1,645,191
Selling, general and administrative expenses	231,681	194,058	450,598	392,511
Depreciation and amortization expense	31,274	21,121	62,711	43,267
Income from operations	126,476	120,561	225,806	231,093
Interest and other income, net	3,519	12,036	9,333	27,078
Foreign exchange (loss)/gain	(6,227)	1,213	(16,954)	(706)
Income before provision for income taxes	123,768	133,810	218,185	257,465
Provision for income taxes	35,742	35,165	56,677	42,577
Net income	$ 88,026	$ 98,645	$ 161,508	$ 214,888
Net income per share:
Basic (in usd per share)	$ 1.56	$ 1.71	$ 2.86	$ 3.72
Diluted (in usd per share)	$ 1.56	$ 1.70	$ 2.84	$ 3.67
Shares used in calculation of net income per share:
Basic (in shares)	56,319	57,594	56,548	57,716
Diluted (in shares)	56,536	58,149	56,898	58,540