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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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