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Construction Joint Ventures - Construction Joint Ventures, Partner Income (Details) - Joint Ventures - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Revenues	$ 158,291	$ 115,441	$ 93,848
Income before tax	20,449	8,097	7,827
Sterling's noncontrolling interest, revenue	76,419	55,134	44,948
Sterling noncontrolling interest, Income before tax	$ 8,170	$ 4,104	$ 3,847

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