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Construction Joint Ventures - SEMA Financials (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Operating income	$ 22,755	$ 12,103
Net income	10,555	3,115
Revenues	315,316	296,688
Joint Ventures | Variable Interest Entity, Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Revenues	8,242	4,064
Operating income	2,527	296
Net income	$ 2,528	299
RLW | Joint Ventures
Schedule of Equity Method Investments [Line Items]
Ownership percentage	51.00%
SEMA Construction Inc | Joint Ventures
Schedule of Equity Method Investments [Line Items]
Operating income	$ 2,527	296
Net income	2,528	299
Revenues	$ 8,242	$ 4,064

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