Acquisitions - PLH and FIH (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 01, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Acquisitions
Net cash paid				$ (9,300)		$ 478,438
Identifiable assets acquired and liabilities assumed
Goodwill		$ 857,650		857,650			$ 871,808
Transaction and related costs		$ 1,084	$ 12,706	4,677		$ 18,228
Adjustments to goodwill				$ (14,158)
PLH Group Inc
Acquisitions
Total purchase consideration	$ 472,193
Less cash and restricted cash acquired	(43,152)
Net cash paid	429,041
Identifiable assets acquired and liabilities assumed
Cash, cash equivalents and restricted cash	43,152
Accounts receivable	74,739
Contract assets	74,700
Prepaid expenses and other current assets	10,858
Property, plant and equipment	51,824
Operating lease assets	16,340
Deferred tax assets	21,731
Other long-term assets	6,466
Accounts payable and accrued liabilities	(105,427)
Contract liabilities	(49,629)
Long-term debt (including current portion)	(3,313)
Noncurrent operating lease liabilities, net of current	(12,004)
Other long-term liabilities	(7,445)
Total identifiable net assets	210,892
Goodwill	261,301
Total	472,193
Increase in contract liabilities					$ 24,100
Change in deferred taxes					18,800
Increase (decrease) in working capital					(9,300)
Increase (decrease) to intangible assets					(13,700)
Increase (decrease) in fixed assets					(11,700)
Adjustments to goodwill					$ 34,800
PLH Group Inc | Customer relationships
Identifiable assets acquired and liabilities assumed
Intangible assets	$ 77,300
Useful life	15 years
PLH Group Inc | Tradename
Identifiable assets acquired and liabilities assumed
Intangible assets	$ 11,600
Useful life	1 year 10 months 24 days