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Construction Joint Ventures - Construction Joint Ventures, Partner Share (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Current assets $ 416,447 $ 357,521
Current liabilities (337,692) (293,504)
Sterling’s receivables from and equity in noncontrolling construction joint ventures 12,396 9,196
Joint Ventures    
Schedule of Equity Method Investments [Line Items]    
Current assets 136,284 92,710
Current liabilities (142,553) (86,705)
Sterling’s receivables from and equity in noncontrolling construction joint ventures $ 12,396 $ 9,196