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Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Revenues	$ 403,579	$ 365,962
Operating Income (Loss)	32,627	29,363
Acquisition related costs	(190)	(255)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	403,579	365,962
Operating Income (Loss)	38,276	35,086
Corporate
Segment Reporting Information [Line Items]
Operating Income (Loss)	(5,459)	(5,468)
E-Infrastructure Solutions RPOs | Operating Segments
Segment Reporting Information [Line Items]
Revenues	205,840	168,927
Operating Income (Loss)	24,269	21,285
Transportation Solutions Revenues | Operating Segments
Segment Reporting Information [Line Items]
Revenues	111,139	116,141
Operating Income (Loss)	5,306	4,443
Building Solutions RPOs - Commercial | Operating Segments
Segment Reporting Information [Line Items]
Revenues	86,600	80,894
Operating Income (Loss)	$ 8,701	$ 9,358

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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