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Summary of Significant Accounting Policies - Investments in Affiliates and Other Entities (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2014
substation
kV
km
Summary Of Significant Accounting Policies [Line Items]          
Loss from equity method investment $ 2,683   $ (60,390)    
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      
Infrastructure Investors Partnership          
Summary Of Significant Accounting Policies [Line Items]          
Investment balance 21,100        
Water and Gas Pipeline Infrastructure Contractor          
Summary Of Significant Accounting Policies [Line Items]          
Equity interest acquired       30.00%  
Cash subscription price $ 18,400        
Equity Method Investment in Electric Power Infrastructure Services Company          
Summary Of Significant Accounting Policies [Line Items]          
Equity interest 49.00%        
Payments to acquire equity method investments and intangible assets       $ 12,300  
Capital contributions to equity method investments $ 2,400        
Upstream Oil and Gas Investment Fund          
Summary Of Significant Accounting Policies [Line Items]          
Investment balance $ 10,200        
Equity interest 16.00%        
Loss from equity method investment $ 3,100