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Segment Information - Additional information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of business segments (segment) | segment	2
Contract revenues	$ 592,486	$ 518,470
C&I
Segment Reporting Information [Line Items]
Contract revenues	277,578	259,200
C&I | CANADA
Segment Reporting Information [Line Items]
Contract revenues	$ 17,700	$ 18,100

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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