Annual report pursuant to Section 13 and 15(d)

Transportation and Distribution Revenue - Additional Information (Details)

v3.19.3.a.u2
Transportation and Distribution Revenue - Additional Information (Details) - USD ($)
$ in Thousands
11 Months Ended 12 Months Ended 143 Months Ended
Jan. 01, 2018
Nov. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2030
Concentration Risk [Line Items]            
Cumulative adjustment for ASC 606 adoption $ 3,300          
Unrecognized performance obligations   $ 992        
Remaining performance obligation     $ 58,100      
Contract asset balance     $ 206 $ 181    
Natural gas transportation contracts | Product and services | Revenue            
Concentration Risk [Line Items]            
Concentration percentage     67.80% 64.30% 71.50%  
Natural gas distribution contracts | Product and services | Revenue            
Concentration Risk [Line Items]            
Concentration percentage     25.50% 26.80% 20.40%  
Forecast            
Concentration Risk [Line Items]            
Recognized performance obligations quarterly           $ 138