Risk Management and Derivative Instruments - Gross Fair Value of Derivative Instruments by Appropriate Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments and Hedges, Assets [Abstract]
Asset Derivatives, Net recorded fair value	$ 0	$ 873
Liability Derivatives, Net recorded fair value	53,144	10,824
Liability Derivatives, Net recorded fair value	9,664	847
Short-Term Derivative Instruments [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Total assets	4,804	6,088
Asset Derivatives, Netting arrangements	(4,804)	(6,088)
Asset Derivatives, Net recorded fair value	0	0
Liability Derivatives, Gross fair value	57,948	16,912
Liability Derivatives, Netting arrangements	(4,804)	(6,088)
Liability Derivatives, Net recorded fair value	53,144	10,824
Short-Term Derivative Instruments [Member] | Commodity derivatives [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Total assets	4,804	6,088
Liability Derivatives, Gross fair value	57,325	15,007
Short-Term Derivative Instruments [Member] | Interest Rate Swaps [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Total assets	0	0
Liability Derivatives, Gross fair value	623	1,905
Long-Term Derivative Instruments [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Total assets	3,163	9,361
Asset Derivatives, Netting arrangements	(3,163)	(8,488)
Asset Derivatives, Net recorded fair value	0	873
Liability Derivatives, Gross fair value	12,827	9,335
Liability Derivatives, Netting arrangements	(3,163)	(8,488)
Liability Derivatives, Net recorded fair value	9,664	847
Long-Term Derivative Instruments [Member] | Commodity derivatives [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Total assets	3,163	9,361
Liability Derivatives, Gross fair value	12,827	8,488
Long-Term Derivative Instruments [Member] | Interest Rate Swaps [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Total assets	0	0
Liability Derivatives, Gross fair value	$ 0	$ 847