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Construction Joint Ventures - Construction Joint Ventures, Partner Share (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Current assets $ 371,088 $ 357,521
Current liabilities 286,332 293,504
Sterling’s receivables from and equity in noncontrolling construction joint ventures 10,789 9,196
Joint Ventures    
Schedule of Equity Method Investments [Line Items]    
Current assets 60,517 92,710
Current liabilities 77,164 86,705
Sterling’s receivables from and equity in noncontrolling construction joint ventures $ 10,789 $ 9,196