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
Mar. 31, 2017
Mar. 31, 2016
Successor [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives $ 17,016  
Predecessor [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives   $ 4,492