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
1 Months Ended 2 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 12, 2016
Sep. 30, 2017
Sep. 12, 2016
Sep. 30, 2017
Successor [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivatives $ (4,369)   $ (12,275)   $ 15,802
Predecessor [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivatives   $ 8,934   $ (8,333)