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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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