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Construction Joint Ventures - Income Statement Information (Details) - Joint Ventures - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]
Revenues	$ 55,306	$ 25,463	$ 86,690	$ 56,820
Income before tax	8,844	2,192	10,813	5,596
Sterling’s noncontrolling interest:
Revenues	25,971	12,564	41,655	27,629
Income before tax	$ 3,116	$ 1,167	$ 4,100	$ 2,858

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