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Construction Joint Ventures - Construction Joint Ventures, Partner Income (Details) - Joint Ventures - Equity Method Investment, Nonconsolidated Investee or Group of Investees - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Revenues | $ 198,497 | $ 158,291 | $ 115,441
Income before tax | 22,517 | 20,449 | 8,097
Sterling’s noncontrolling interest: |  |  |
Revenues | 88,825 | 76,419 | 55,134
Income before tax | $ 10,061 | $ 8,170 | $ 4,104

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