Acquisitions - PLH (Details) - USD ($) $ in Thousands		2 Months Ended	3 Months Ended		9 Months Ended
	Aug. 01, 2022	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Acquisitions
Net cash paid					$ 478,438	$ 606,974
Identifiable assets acquired and liabilities assumed
Goodwill		$ 820,322	$ 820,322		820,322		$ 581,664
Transaction and related costs			12,706	$ 447	18,228	$ 14,823
PLH Group Inc
Acquisitions
Total purchase consideration	$ 481,493
Less cash and restricted cash acquired	(43,152)
Net cash paid	438,341
Identifiable assets acquired and liabilities assumed
Cash, cash equivalents and restricted cash	43,152
Accounts receivable	74,411
Contract assets	75,359
Prepaid expenses and other current assets	13,444
Property, plant and equipment	63,528
Operating lease assets	16,340
Deferred tax assets	6,008
Other long-term assets	6,418
Accounts payable and accrued liabilities	(98,282)
Contract liabilities	(25,488)
Long-term debt (including current portion)	(3,313)
Noncurrent operating lease liabilities, net of current	(12,004)
Deferred tax liability	(3,032)
Other long-term liabilities	(4,136)
Total identifiable net assets	255,005
Goodwill	226,488
Total	481,493
Revenue since acquisition		155,700
Gross profit since acquisition		$ 12,300
Transaction and related costs			$ 12,700		$ 18,200
PLH Group Inc | Customer relationships
Identifiable assets acquired and liabilities assumed
Intangible assets	$ 84,900
Useful life	15 years
PLH Group Inc | Tradename
Identifiable assets acquired and liabilities assumed
Intangible assets	$ 17,700
Useful life	1 year 9 months 18 days