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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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Revenues	$ 69,116	$ 58,541	$ 181,022	$ 128,853
Income before tax	9,311	7,814	22,726	14,487
Sterling’s noncontrolling interest:
Revenues	30,326	26,195	79,264	58,653
Income before tax	$ 4,149	$ 3,541	$ 9,959	$ 6,559

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