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Construction Joint Ventures - Income Statement Information (Details) - Joint Ventures - Equity Method Investment, Nonconsolidated Investee or Group of Investees - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenues | $ 69,116 | $ 58,541 | $ 181,022 | $ 128,853
Income before tax | 9,311 | 7,814 | 22,726 | 14,487
Sterling’s noncontrolling interest: |  |  |  |
Revenues | 30,326 | 26,195 | 79,264 | 58,653
Income before tax | $ 4,149 | $ 3,541 | $ 9,959 | $ 6,559

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