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Summary of Significant Accounting Policies - Investments in Affiliates and Other Entities (Details) mile in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) mile | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2014 kV substation km
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates | $ 5,260 |  |  | $ 1,931 |  | $ (2,207) | $ 64,078 |
Impairment of cost method investment | $ 0 |  |  | $ 0 |  | 9,311 | $ 0 |
EPC Electric Transmission Project |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Length of electrical transmission line to be constructed under contract | km |  |  |  |  |  |  |  | 500
Number of substations | substation |  |  |  |  |  |  |  | 2
Voltage of substations | kV |  |  |  |  |  |  |  | 500
Deferred earnings recognized |  |  |  |  | $ 60,300 |  |  |
Gain related to the sale of interest in limited partnership |  |  | $ 13,000 |  |  |  |  |
LUMA Energy, LLC |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Term of operation and maintenance agreement | 15 years |  |  |  |  |  |  |
Length of electric transmission and distribution system | mile | 18 |  |  |  |  |  |  |
Transition period | 1 year |  |  |  |  |  |  |
Certain Non-Integral Equity Investments |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  | $ (8,700) |  |
LUMA Energy, LLC |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity interest | 50.00% |  |  |  |  | 50.00% |  |
Investment balance | $ 5,300 |  |  |  |  | $ 5,300 |  |
Infrastructure Investors Partnership |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Investment balance | 21,400 |  |  |  |  | $ 21,400 |  |
Water and Gas Pipeline Infrastructure Contractor |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Equity interest acquired |  |  |  |  |  | 30.00% |  |
Investment balance | $ 11,800 |  |  |  |  | $ 11,800 |  |
Remaining equity interest which the company has an option to acquire | 70.00% |  |  |  |  |  |  |
Impairment of cost method investment |  | $ 9,300 |  |  |  |  |  |

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