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Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Gross Amounts of Recognized Assets $ 306,620 $ 152,692
Gross Amounts Offset in the Balance Sheet (43,065) (15,138)
Net Amounts of Assets Presented in the Balance Sheet 263,555 137,554
Gross Amounts of Recognized (Liabilities) (49,888) (29,206)
Gross Amounts Offset in the Balance Sheet 43,065 15,138
Net Amounts of (Liabilities) Presented in the Balance Sheet (6,823) (14,068)
Commodity | Swaps | Natural Gas    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 192,244 134,364
Gross Amounts Offset in the Balance Sheet (448) (2,913)
Net Amounts of Assets Presented in the Balance Sheet 191,796 131,451
Gross Amounts of Recognized (Liabilities) (448) (1,657)
Gross Amounts Offset in the Balance Sheet 448 2,913
Net Amounts of (Liabilities) Presented in the Balance Sheet 0 1,256
Commodity | Swaps | Crude Oil    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 67,765 3,893
Gross Amounts Offset in the Balance Sheet (4,024) (4,794)
Net Amounts of Assets Presented in the Balance Sheet 63,741 (901)
Gross Amounts of Recognized (Liabilities) (4,024) (4,814)
Gross Amounts Offset in the Balance Sheet 4,024 4,794
Net Amounts of (Liabilities) Presented in the Balance Sheet 0 (20)
Commodity | Swaps | NGLs (C3-Propane)    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 8,753  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Assets Presented in the Balance Sheet 8,753  
Commodity | Swaps | NGLs (iC4-Isobutane)    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 673  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Assets Presented in the Balance Sheet 673  
Commodity | Swaps | NGLs (NC4-Normal Butane)    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 5,046  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Assets Presented in the Balance Sheet 5,046  
Gross Amounts of Recognized (Liabilities) (44)  
Gross Amounts Offset in the Balance Sheet 44  
Net Amounts of (Liabilities) Presented in the Balance Sheet 0  
Commodity | Swaps | NGLs (C5-Natural Gasoline)    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 1,589 60
Gross Amounts Offset in the Balance Sheet 0 (127)
Net Amounts of Assets Presented in the Balance Sheet 1,589 (67)
Gross Amounts of Recognized (Liabilities)   (127)
Gross Amounts Offset in the Balance Sheet   127
Net Amounts of (Liabilities) Presented in the Balance Sheet   0
Commodity | Swaps | NGLs (C4- Butane)    
Derivative [Line Items]    
Gross Amounts of Recognized Assets   167
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Assets Presented in the Balance Sheet   167
Commodity | Swaptions | Natural Gas    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 0 0
Gross Amounts Offset in the Balance Sheet (3,719) (1,325)
Net Amounts of Assets Presented in the Balance Sheet (3,719) (1,325)
Gross Amounts of Recognized (Liabilities) (4,171) (2,594)
Gross Amounts Offset in the Balance Sheet 3,719 1,325
Net Amounts of (Liabilities) Presented in the Balance Sheet (452) (1,269)
Commodity | Swaptions | Crude Oil    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 0 0
Gross Amounts Offset in the Balance Sheet (11) (1,597)
Net Amounts of Assets Presented in the Balance Sheet (11) (1,597)
Gross Amounts of Recognized (Liabilities) (11) (2,254)
Gross Amounts Offset in the Balance Sheet 11 1,597
Net Amounts of (Liabilities) Presented in the Balance Sheet 0 (657)
Commodity | Calls | Natural Gas    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 0  
Gross Amounts Offset in the Balance Sheet (23)  
Net Amounts of Assets Presented in the Balance Sheet (23)  
Gross Amounts of Recognized (Liabilities) (23)  
Gross Amounts Offset in the Balance Sheet 23  
Net Amounts of (Liabilities) Presented in the Balance Sheet 0  
Commodity | Calls | Crude Oil    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 0 0
Gross Amounts Offset in the Balance Sheet (6) (349)
Net Amounts of Assets Presented in the Balance Sheet (6) (349)
Gross Amounts of Recognized (Liabilities) (6) (349)
Gross Amounts Offset in the Balance Sheet 6 349
Net Amounts of (Liabilities) Presented in the Balance Sheet 0 0
Commodity | Calls | NGLs (NC4-Normal Butane)    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 0  
Gross Amounts Offset in the Balance Sheet (44)  
Net Amounts of Assets Presented in the Balance Sheet (44)  
Commodity | Three Way Collars | Natural Gas    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 1,914  
Gross Amounts Offset in the Balance Sheet (8,612)  
Net Amounts of Assets Presented in the Balance Sheet (6,698)  
Gross Amounts of Recognized (Liabilities) (13,276)  
Gross Amounts Offset in the Balance Sheet 8,612  
Net Amounts of (Liabilities) Presented in the Balance Sheet (4,664)  
Commodity | Basis Swap | Natural Gas    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 5,597 10,766
Gross Amounts Offset in the Balance Sheet (436) (1,092)
Net Amounts of Assets Presented in the Balance Sheet 5,161 9,674
Gross Amounts of Recognized (Liabilities) (777) (1,371)
Gross Amounts Offset in the Balance Sheet 436 1,092
Net Amounts of (Liabilities) Presented in the Balance Sheet (341) (279)
Commodity | Spread Swaps | NGLs (C3-Propane)    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 23,039 1,913
Gross Amounts Offset in the Balance Sheet (22,388) (1,913)
Net Amounts of Assets Presented in the Balance Sheet 651 0
Gross Amounts of Recognized (Liabilities) (22,388) (16,040)
Gross Amounts Offset in the Balance Sheet 22,388 1,913
Net Amounts of (Liabilities) Presented in the Balance Sheet 0 (14,127)
Freight | Swaps    
Derivative [Line Items]    
Gross Amounts of Recognized Assets 0 1,529
Gross Amounts Offset in the Balance Sheet (3,354) (1,028)
Net Amounts of Assets Presented in the Balance Sheet (3,354) 501
Gross Amounts of Recognized (Liabilities) (4,720) 0
Gross Amounts Offset in the Balance Sheet 3,354 1,028
Net Amounts of (Liabilities) Presented in the Balance Sheet $ (1,366) $ 1,028