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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives $ (34,349) $ 13,603 $ 116,770 $ (54,414)
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments (876) 0 (7,559) 0
Gain (Loss) on Commodity Derivative Instruments (33,473) 13,603 124,329 (54,414)
Cash Settlements Interest Rate Swap Operating Activities (436) 0 (368) 0
Cash Settlements Commodity Operating Activities 59,582 (8,301) 59,245 (3,907)
Cash settlements and premiums received (paid), net $ 59,146 $ (8,301) $ 58,877 $ (3,907)