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Construction Joint Ventures - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sterling’s noncontrolling interest:
Revenues	$ 46	$ 1,191
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Revenues	31,384	31,357
Income before tax	1,969	3,404
Sterling’s noncontrolling interest:
Revenues	15,684	15,065
Income before tax	$ 984	$ 1,691

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