Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 49,222	$ 112,457	$ 30,518	$ 254,334
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	91,291	95,366	263,487	262,132
Amortization of intangible assets	27,979	23,352	81,242	54,522
Non-cash stock-based compensation expense			18,870	17,673
(Benefit from) provision for deferred income taxes			(9,293)	439
Equity in earnings of unconsolidated affiliates, net	(6,059)	(8,714)	(19,423)	(23,585)
Gains on sales of assets, net			(21,914)	(10,704)
Non-cash interest expense, net			2,574	2,342
Other non-cash items, net			1,601	(8,218)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable			(22,065)	(59,665)
Contract assets			(383,053)	(109,399)
Inventories			(36,130)	11,968
Other assets, current and long-term portion			34,060	(8,998)
Accounts payable and accrued expenses			293,899	134,487
Contract liabilities			(66,027)	(7,478)
Other liabilities, current and long-term portion			(49,675)	(10,753)
Net cash provided by operating activities			118,671	499,097
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired			(71,841)	(604,907)
Capital expenditures			(213,325)	(132,348)
Proceeds from sale of property and equipment			47,195	25,465
Payments for other investments			(3,723)	(7,111)
Proceeds from other investments			0	557
Other investing activities, net			0	1,650
Net cash used in investing activities			(241,694)	(716,694)
Cash flows from financing activities:
Proceeds from credit facilities			2,578,000	795,414
Repayments of credit facilities			(2,429,583)	(606,575)
Payments of finance lease obligations			(131,259)	(117,437)
Repurchases of common stock			(81,291)	0
Payments of acquisition-related contingent consideration			(35,149)	(21,675)
Payments for acquisition-related contingent assets			(17,636)	0
Payments to non-controlling interests, including acquisition of interests			0	(8,965)
Payments for stock-based awards			(4,061)	(3,795)
Other financing activities, net			(18,499)	(2,503)
Net cash (used in) provided by financing activities			(139,478)	34,464
Effect of currency translation on cash			(2,559)	(61)
Net decrease in cash and cash equivalents			(265,060)	(183,194)
Cash and cash equivalents - beginning of period			360,736	423,118	$ 423,118
Cash and cash equivalents - end of period	$ 95,676	$ 239,924	95,676	239,924	$ 360,736
Supplemental cash flow information:
Interest paid			69,327	49,133
Income tax payments, net			1,827	62,720
Supplemental disclosure of non-cash information:
Additions to property and equipment from finance leases			$ 184,700	$ 128,337