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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, 2022	Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]
Revenues	$ 58,559	$ 49,417
Income before tax	6,777	4,635
Sterling’s noncontrolling interest:
Revenues	26,608	21,944
Income before tax	$ 3,067	$ 2,135

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