Annual report pursuant to Section 13 and 15(d)

Fair Value - Additional Information (Details)

v3.10.0.1
Fair Value - Additional Information (Details)
$ / shares in Units, $ in Thousands, Bcf / d in Billions
 12 Months Ended
Dec. 21, 2017
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Bcf / d
Schedule of Equity Method Investments [Line Items]      
Proceeds from sale of interest $ 7,600    
Lightfoot Capital Partners LP      
Schedule of Equity Method Investments [Line Items]      
Equity interest percentage   6.60% 6.60%
Lightfoot GP      
Schedule of Equity Method Investments [Line Items]      
Equity interest percentage   1.50% 1.50%
Lightfoot Capital Partners LP | Gulf LNG      
Schedule of Equity Method Investments [Line Items]      
Receiving and regasification terminal, volume per day (bcf/d) | Bcf / d     1.5
Arc Terminal Joliet Holdings      
Schedule of Equity Method Investments [Line Items]      
Required reinvestment $ 1,200    
Gulf LNG | Zenith      
Schedule of Equity Method Investments [Line Items]      
Interest acquired 4.16%    
Payments to acquire $ 27,300    
Arc Terminal Joliet Holdings | Lightfoot LP and Lightfoot GP      
Schedule of Equity Method Investments [Line Items]      
Interest acquired 13.50%    
Arc Logistics GP | Lightfoot GP      
Schedule of Equity Method Investments [Line Items]      
Equity issued (in dollars per unit) | $ / shares $ 14.50    
Proceeds from sale of interest $ 94,500    
Percentage of interest sold 100.00%    
Gulf LNG | Lightfoot GP      
Schedule of Equity Method Investments [Line Items]      
Proceeds from sale of interest $ 36,200 $ 667  
Percentage of interest sold 5.52%    
Realized loss on sale of investment   $ 1,100