CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenues	$ 4,824,698	$ 3,758,144	$ 2,659,478
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	3,286,683	2,483,697	1,732,522
Selling, general and administrative expenses	872,777	648,736	484,758
Depreciation and amortization expense	92,272	83,395	62,874
Income from operations	572,966	542,316	379,324
Interest and other income/(loss), net	10,025	(1,727)	3,822
Foreign exchange loss	(75,733)	(7,197)	(4,667)
Income before provision for income taxes	507,258	533,392	378,479
Provision for income taxes	87,842	51,740	51,319
Net income	$ 419,416	$ 481,652	$ 327,160
Net income per share:
Basic (in dollars per share)	$ 7.32	$ 8.52	$ 5.87
Diluted (in dollars per share)	$ 7.09	$ 8.15	$ 5.60
Shares used in calculation of net income per share:
Basic (in shares)	57,291	56,511	55,727
Diluted (in shares)	59,169	59,064	58,446