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Construction Joint Ventures - Construction Joint Ventures, Partner Income (Details) - Joint Ventures - Equity Method Investment, Nonconsolidated Investee or Group of Investees - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Revenues	$ 198,497	$ 158,291	$ 115,441
Income before tax	22,517	20,449	8,097
Sterling’s noncontrolling interest:
Revenues	88,825	76,419	55,134
Income before tax	$ 10,061	$ 8,170	$ 4,104

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