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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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