Derivative Activities - Effects of Derivatives on Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Derivative Fair Value (Loss) Income	$ (652,220)	$ (124,690)	$ (959,782)	$ 102,182
Contingent Consideration
Derivative [Line Items]
Derivative Fair Value (Loss) Income	12,870	430	34,260	430
Swaptions
Derivative [Line Items]
Derivative Fair Value (Loss) Income	(33,718)	(14,166)	(50,329)	(15,520)
Three Way Collars
Derivative [Line Items]
Derivative Fair Value (Loss) Income	(173,344)	(20,705)	(226,176)	(38,267)
Collars
Derivative [Line Items]
Derivative Fair Value (Loss) Income	(106,340)	(16,893)	(158,562)	(14,336)
Calls
Derivative [Line Items]
Derivative Fair Value (Loss) Income	(10,018)	(255)	(10,793)	(12)
Basis Swaps
Derivative [Line Items]
Derivative Fair Value (Loss) Income	(8,469)	15,587	11,054	31,750
Commodity | Swaps
Derivative [Line Items]
Derivative Fair Value (Loss) Income	(332,855)	(91,425)	(558,186)	142,413
Freight | Swaps
Derivative [Line Items]
Derivative Fair Value (Loss) Income	$ (346)	$ 2,737	$ (1,050)	$ (4,276)