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Construction Joint Ventures - Income Statement Information (Details) - Joint Ventures - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Schedule of Equity Method Investments [Line Items]        
Revenues $ 48,543 $ 69,116 $ 165,020 $ 181,022
Income before tax 4,292 9,311 18,636 22,726
Sterling’s noncontrolling interest:        
Revenues 20,778 30,326 71,356 79,264
Income before tax $ 1,760 $ 4,149 $ 7,775 $ 9,959