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Construction Joint Ventures - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Sterling’s noncontrolling interest:
Revenues			$ 2,158	$ 1,272
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Revenues	$ 25,463	$ 18,897	56,820	33,507
Income before tax	2,192	1,497	5,596	2,670
Sterling’s noncontrolling interest:
Revenues	12,564	8,674	27,629	15,163
Income before tax	$ 1,167	$ 718	$ 2,858	$ 1,271

X

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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