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v3.21.2

Commitments and Contingencies - Investment Arrangements (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) constructionProject | Dec. 31, 2020 USD ($)
Other Commitments [Line Items] |  |
Number of joint ventures | constructionProject | 3 |
Cash | $ 239,924 | $ 423,118
Proportionately Consolidated Non-Controlled Joint Venture |  |
Other Commitments [Line Items] |  |
Cash | 10,800 | $ 8,200
Payments for advance to affiliate | $ 700 |
Proportionately Consolidated Non-Controlled Joint Venture | Joint Ventures That Provide Electrical Transmission Infrastructure Services | Minimum |  |
Other Commitments [Line Items] |  |
Proportionately consolidated non-controlled joint venture, ownership percentage | 85.00% |
Proportionately Consolidated Non-Controlled Joint Venture | Joint Ventures That Provide Electrical Transmission Infrastructure Services | Maximum |  |
Other Commitments [Line Items] |  |
Proportionately consolidated non-controlled joint venture, ownership percentage | 90.00% |
Proportionately Consolidated Non-Controlled Joint Venture | Joint Venture Civil Construction Project | Minimum |  |
Other Commitments [Line Items] |  |
Proportionately consolidated non-controlled joint venture, ownership percentage | 30.00% |
Proportionately Consolidated Non-Controlled Joint Venture | Joint Venture Civil Construction Project | Maximum |  |
Other Commitments [Line Items] |  |
Proportionately consolidated non-controlled joint venture, ownership percentage | 50.00% |

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