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Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Revenues	$ 410,320	$ 315,316
Operating Income	28,269	22,755
Acquisition related costs	(255)	0
Operating Segments
Segment Reporting Information [Line Items]
Revenues	410,320	315,316
Operating Income	34,329	27,839
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Operating Income	(5,805)	(5,084)
E-Infrastructure Solutions Backlog | Operating Segments
Segment Reporting Information [Line Items]
Revenues	168,927	96,572
Operating Income	21,285	17,812
Transportation Solutions Revenues | Operating Segments
Segment Reporting Information [Line Items]
Revenues	160,499	147,054
Operating Income	3,686	2,666
Building Solutions Backlog - Commercial | Operating Segments
Segment Reporting Information [Line Items]
Revenues	80,894	71,690
Operating Income	$ 9,358	$ 7,361

X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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