Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Cash flows from operating activities:
Net income (loss)	$ 105,410	$ 15,305	$ 114,719	$ (48,487)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	80,193	115,033	289,769	325,318
Amortization of intangible assets	34,368	42,266	101,669	126,252
Non-cash stock-based compensation expense			24,046	24,336
Benefit from deferred income taxes			(10,342)	(77,781)
Equity in earnings of unconsolidated affiliates, net	(7,042)	(6,787)	(22,153)	(23,434)
Gains on sales and impairments of assets, net			(18,267)	(19,082)
Loss on extinguishment of debt	0	0	11,344	0
Non-cash interest expense, net			4,105	4,354
Other non-cash items, net			10,980	3,827
Changes in assets and liabilities, net of acquisitions:
Accounts receivable			(49,060)	(118,448)
Contract assets			111,870	(244,340)
Inventories			18,742	24,569
Other assets, current and long-term portion			48,283	76,234
Accounts payable and accrued expenses			(201,139)	104,755
Contract liabilities			224,531	70,976
Other liabilities, current and long-term portion			(9,171)	(32,477)
Net cash provided by operating activities			649,926	196,572
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired			(33,811)	(68,817)
Capital expenditures			(100,538)	(157,369)
Proceeds from sales of property and equipment			49,028	55,936
Payments for other investments			(585)	(1,899)
Proceeds from other investments			1,503	425
Other investing activities, net			3,605	41
Net cash used in investing activities			(80,798)	(171,683)
Cash flows from financing activities:
Proceeds from credit facilities			3,103,000	3,256,200
Repayments of credit facilities and term loans			(4,148,813)	(3,268,763)
Proceeds from issuance of 5.900% senior notes			549,758	0
Repayments of 6.625% senior notes			(224,046)	0
Payments of finance lease obligations			(113,260)	(120,198)
Payments of acquisition-related contingent consideration			(24,506)	(21,638)
Payments to non-controlling interests, including acquisition of interests and distributions			(23,499)	(11,660)
Payments for stock-based awards			(2,801)	(10,293)
Other financing activities, net			(32,346)	(5,235)
Net cash used in financing activities			(916,513)	(181,587)
Effect of currency translation on cash			(951)	280
Net decrease in cash and cash equivalents			(348,336)	(156,418)
Cash and cash equivalents - beginning of period			529,561	370,592	$ 370,592
Cash and cash equivalents - end of period	$ 181,225	$ 214,174	181,225	214,174	$ 529,561
Supplemental cash flow information:
Interest paid			150,972	187,353
Income taxes paid, net of refunds			45,433	15,023
Supplemental disclosure of non-cash information:
Additions to property and equipment from finance leases and other financing arrangements			$ 100,094	$ 129,935