Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Impact of Derivative Activities on Condensed Consolidated Statements of Income (Detail)

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Derivative Instruments - Impact of Derivative Activities on Condensed Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives $ (44,368) $ 151,119
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments 32 (6,683)
Gain (Loss) on Commodity Derivative Instruments (44,400) 157,802
Cash Settlements Interest Rate Swap Operating Activities (922) 68
Cash Settlements Commodity Operating Activities (6,247) (337)
Cash settlements and premiums received (paid), net $ (7,169) $ (269)