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Construction Joint Ventures - Income Statement Information (Details) - Joint Ventures - Equity Method Investment, Nonconsolidated Investee or Group of Investees - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]        
Revenues $ 62,489 $ 43,466 $ 111,906 $ 70,312
Income before tax 8,780 4,516 13,415 6,673
Sterling’s noncontrolling interest:        
Revenues 26,994 19,377 48,938 32,459
Income before tax $ 3,676 $ 1,968 $ 5,811 $ 3,017