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Construction Joint Ventures - Income Statement Information (Details) - Joint Ventures - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Revenues	$ 58,541	$ 40,875	$ 128,853	$ 127,565
Income before tax	7,814	3,588	14,487	14,401
Sterling’s noncontrolling interest:
Revenues	26,195	20,119	58,653	61,774
Income before tax	$ 3,541	$ 1,769	$ 6,559	$ 5,869

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