Quarterly report pursuant to Section 13 or 15(d)

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

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Impact of Derivative Activities on Condensed Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives $ (6,891) $ 24,248 $ 109,879 $ (30,166)
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments 32 0 (7,527) 0
Gain (Loss) on Commodity Derivative Instruments (6,923) 24,248 117,406 (30,166)
Cash Settlements Interest Rate Swap Operating Activities (919) 0 (1,287) 0
Cash Settlements Commodity Operating Activities 7,337 (423) 66,582 (4,330)
Cash settlements and premiums received (paid), net $ 6,418 $ (423) $ 65,295 $ (4,330)