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Summary of Significant Accounting Policies - Investments in Affiliates and Other Entities (Details) mile in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) mile | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity method investments |  | $ 73,800 |  |  | $ 73,800 |  |  | $ 44,900
Equity in earnings (losses) of unconsolidated affiliates |  | 10,758 | $ 5,260 |  | 24,734 | $ (2,207) |  |
Investment in real estate |  | 23,400 |  |  | 23,400 |  | $ 23,500 |
Impairment of cost method investment |  | 0 | $ 0 |  | 0 | 9,311 |  |
Length of electric transmission and distribution system | mile |  |  |  | 18 |  |  |  |
Quanta Services, Inc. |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cost method investments |  | 130,200 |  |  | 130,200 |  |  | 39,500
LUMA Energy, LLC |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Term of operation and maintenance agreement |  |  |  | 15 years |  |  |  |
Integral Affiliates |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Due from related parties |  | 13,300 |  |  | 13,300 |  |  |
Due to related parties |  | 3,200 |  |  | 3,200 |  |  |
Certain Non-Integral Equity Investments |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  | $ (8,700) |  |
Broadband Technology Provider |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cost method investments |  |  |  |  |  |  | $ 90,000 |
Cost Method Investment | Quanta Services, Inc. |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Impairment of cost method investment |  |  |  | $ 9,300 |  |  |  |
LUMA Energy, LLC |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity method investments |  | $ 34,500 |  |  | $ 34,500 |  |  | $ 10,900
Equity interest |  |  |  | 50.00% |  |  |  |
Integral Unconsolidated Affiliates | Subsequent Event |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity interest | 44.00% |  |  |  |  |  |  |
Payments to interest in entity | $ 18,000 |  |  |  |  |  |  |

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