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Summary of Significant Accounting Policies - Investments in Affiliates and Other Entities (Details) mile in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) | Jun. 30, 2020 mile | Mar. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Equity method investments | $ 51,100 |  |
Equity in earnings (losses) of unconsolidated affiliates | 5,868 |  | $ (2,683)
Investment in real estate | 23,700 |  |
Length of electric transmission and distribution system | mile |  | 18 |
Quanta Services, Inc. |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cost method investments | 129,300 |  |
LUMA Energy, LLC |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Term of operation and maintenance agreement |  | 15 years |
Certain Non-Integral Equity Investments |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  | $ (3,100)
Cost Method Investment | Quanta Services, Inc. |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Downward price adjustment, cumulative amount | 9,300 |  |
Communications Technology Company |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cost method investments | 90,000 |  |
LUMA Energy, LLC |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Equity method investments | 16,200 |  |
Equity interest |  | 50.00% |
Integral Unconsolidated Affiliates |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Due from related parties | 7,900 |  |
Due to related parties | $ 3,100 |  |

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