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Construction Joint Ventures - SEMA Financials (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Operating income	$ 32,031	$ 28,831	$ 87,506	$ 73,980
Net income	21,126	15,157	$ 51,737	36,482
RLW | Joint Ventures
Schedule of Equity Method Investments [Line Items]
Ownership percentage			51.00%
SEMA Construction Inc | Joint Ventures | Variable Interest Entity, Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Revenues	19,846	4,266	$ 37,412	11,734
Operating income	1,290	290	4,430	961
Net income	$ 1,292	$ 292	$ 4,435	$ 967

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