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Construction Joint Ventures - SEMA Financials (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Revenues	$ 383,458	$ 291,699	$ 1,080,184	$ 779,734
Operating income	28,831	12,115	73,980	28,019
Net income attributable to Sterling common stockholders	$ 15,157	7,957	$ 36,482	17,600
RLW | Joint Ventures
Schedule of Equity Method Investments [Line Items]
Ownership percentage	51.00%		51.00%
SEMA Construction Inc | Joint Ventures
Schedule of Equity Method Investments [Line Items]
Ownership percentage	49.00%		49.00%
Revenues	$ 4,266	768	$ 11,734	2,397
Operating income	290	50	961	162
Net income attributable to Sterling common stockholders	$ 292	$ 51	$ 967	$ 164

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