Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Cash flows from operating activities:
Net income (loss)	$ 12,327	$ (34,459)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	76,225	107,435
Amortization of intangible assets	32,636	33,691
Non-cash stock-based compensation expense	6,943	9,673
Benefit from deferred income taxes	(13,618)	(44,137)
(Recovery of) provision for credit losses	(706)	5,188
Equity in earnings of unconsolidated affiliates, net	(10,313)	(9,219)
(Gains) losses on sales and impairments of assets, net	(6,019)	863
Non-cash interest expense, net	1,197	1,260
Other non-cash items, net	(11)	4,958
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	37,252	75,584
Contract assets	39,472	171,133
Inventories	634	5,912
Other assets, current and long-term portion	(17,680)	33,419
Accounts payable and accrued expenses	(114,224)	(315,792)
Contract liabilities	30,654	67,703
Other liabilities, current and long-term portion	3,596	(5,462)
Net cash provided by operating activities	78,365	107,750
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(4,731)	(61)
Capital expenditures	(47,264)	(25,409)
Proceeds from sales of property and equipment	13,858	10,850
Payments for other investments	0	(63)
Proceeds from other investments	2,650	0
Other investing activities, net	582	1,652
Net cash used in investing activities	(34,905)	(13,031)
Cash flows from financing activities:
Proceeds from credit facilities	516,500	863,000
Repayments of credit facilities and term loans	(528,064)	(1,186,938)
Payments of finance lease obligations	(39,915)	(36,693)
Repurchases of common stock	(26,843)	0
Payments of acquisition-related contingent consideration	(302)	0
Payments to non-controlling interests, including acquisition of interests and distributions	(6,992)	(6,835)
Payments for stock-based awards	(4,762)	(2,724)
Other financing activities, net	(7,316)	(4,632)
Net cash used in financing activities	(97,694)	(374,822)
Effect of currency translation on cash	80	(132)
Net decrease in cash and cash equivalents	(54,154)	(280,235)
Cash and cash equivalents - beginning of period	399,903	529,561	$ 529,561
Cash and cash equivalents - end of period	345,749	249,326	$ 399,903
Supplemental cash flow information:
Interest paid	45,016	61,820
Income tax refunds, net of payments	(2,074)	(3,792)
Supplemental disclosure of non-cash information:
Additions to property and equipment from finance leases and other financing arrangements	$ 64,061	$ 20,602