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Derivative Activities - Additional Information (Detail)
Sep. 30, 2016
USD ($)
MMBTU / d
t_per_M
MMBTU
bbl
Derivatives Excluding Basis Swaps  
Derivative [Line Items]  
Derivative assets liabilities at fair value net $ 150,900,000
Natural Gas | Basis Swaps  
Derivative [Line Items]  
Derivative assets liabilities at fair value net $ 13,800,000
Volume Hedged | MMBTU 59,385,000
Natural Gas | Swaps | 2016  
Derivative [Line Items]  
Volume Hedged | MMBTU / d 901,739 [1]
Natural Gas | Swaps | 2017  
Derivative [Line Items]  
Volume Hedged | MMBTU / d 478,192 [1]
Propane | Spread Swaps  
Derivative [Line Items]  
Derivative assets liabilities at fair value net $ 4,100,000
Propane | Spread Swaps | 2016  
Derivative [Line Items]  
Volume Hedged | bbl 525,000
Propane | Spread Swaps | 2017  
Derivative [Line Items]  
Volume Hedged | bbl 1,837,500
Freight | Swaps | Level 2  
Derivative [Line Items]  
Derivative assets liabilities at fair value net $ (155,000)
Volume Hedged | t_per_M 5,000
[1] Includes derivative instruments assumed in connection with the Memorial Merger.