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Pending Corporate Transactions - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Oct. 18, 2018
Business Acquisition [Line Items]      
Expenses on sale of business and related transactions   $ 0  
General And Administrative Expense      
Business Acquisition [Line Items]      
Expenses on sale of business and related transactions $ 1,700,000    
Sharyland Holdings, LP | Sempra Energy      
Business Acquisition [Line Items]      
Equity interest percentage 50.00%    
Hunt Consolidated, Inc.      
Business Acquisition [Line Items]      
Termination fee related to Sale of InfraREIT, Inc $ 40,500,000    
Oncor Electric Delivery Company LLC | Definitive Agreement      
Business Acquisition [Line Items]      
Business acquisition, share price     $ 21.00
Business acquisition, value in cash     $ 1,275,000,000
Business combination, assumption of net debt $ 940,000,000