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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Revenues	$ 252,026	$ 198,497	$ 158,291
Income before tax	31,684	22,517	20,449
Sterling’s noncontrolling interest:
Revenues	110,627	88,825	76,419
Income before tax	$ 14,150	$ 10,061	$ 8,170

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