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Construction Joint Ventures - SEMA Financials (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Operating income $ 94,892 $ 37,751 $ 42,611
Net income attributable to Sterling common stockholders 42,306 39,901 $ 25,187
Joint Ventures | Variable Interest Entity, Primary Beneficiary      
Schedule of Equity Method Investments [Line Items]      
Revenues 15,800 6,903  
Operating income 1,271 467  
Net income attributable to Sterling common stockholders $ 1,278 $ 471  
RLW | Joint Ventures      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 51.00%