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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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