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Construction Joint Ventures - Income Statement Information (Details) - Joint Ventures - Equity Method Investment, Nonconsolidated Investee or Group of Investees - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Revenues	$ 49,417	$ 26,846
Income before tax	4,635	2,157
Sterling’s noncontrolling interest:
Revenues	21,944	13,082
Income before tax	$ 2,135	$ 1,049

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