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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			12 Months Ended
	Oct. 31, 2020	Jun. 30, 2020 USD ($) mile	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2014 kV substation km
Summary Of Significant Accounting Policies [Line Items]
Impairment of cost method investment					$ 9,311	$ 0	$ 0
Length of electric transmission and distribution system | mile		18
LUMA Energy LLC
Summary Of Significant Accounting Policies [Line Items]
Equity interest		50.00%
Investment balance					10,900
Water and Gas Pipeline Infrastructure Contractor
Summary Of Significant Accounting Policies [Line Items]
Impairment of cost method investment		$ 9,300
Water and Gas Pipeline Infrastructure Contractor | Australia
Summary Of Significant Accounting Policies [Line Items]
Option to acquire interest	70.00%
Balance in investment partnership					$ 12,700
Water and Gas Pipeline Infrastructure Contractor | Australia | Quanta Services, Inc.
Summary Of Significant Accounting Policies [Line Items]
Amount of interest owned					30.00%
Infrastructure Investors Partnership
Summary Of Significant Accounting Policies [Line Items]
Investment balance					$ 21,400
Certain Non-Integral Equity Investments
Summary Of Significant Accounting Policies [Line Items]
Impairment of cost method investment					8,700
Integral Unconsolidated Affiliates
Summary Of Significant Accounting Policies [Line Items]
Related party receivables					$ 14,800
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]
Operation and maintenance period		15 years
Transition period		1 year

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