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Segment Information - Additional information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of business segments (segment) | segment			2
Contract revenues	$ 607,901	$ 583,214	$ 1,639,422	$ 1,500,084
C&I
Segment Reporting Information [Line Items]
Contract revenues	308,162	288,274	803,654	676,686
C&I | CANADA
Segment Reporting Information [Line Items]
Contract revenues	$ 19,600	$ 22,300	$ 58,600	$ 55,800

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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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