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Construction Joint Ventures - Construction Joint Ventures, Partner Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Sterling's noncontrolling interest, revenue	$ 4,353	$ 4,200	$ 1,826
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Revenues	115,441	93,848	62,440
Income before tax	8,097	7,827	5,144
Sterling's noncontrolling interest, revenue	55,134	44,948	25,537
Sterling noncontrolling interest, Income before tax	$ 4,104	$ 3,847	$ 1,980

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