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Schedule of Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
 4 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Schedule Of Unrecognized Tax Benefits [Line Items]      
Begining Balance   $ 23,443  
Additions based on tax positions related to the current year   170  
Additions based on tax positions related to a prior year   2,578  
Settlement and lapse of statute of limitations   (1,045)  
Reductions based on tax positions related to a prior year   (2,864)  
Ending Balance $ 23,443 22,282  
Predecessor      
Schedule Of Unrecognized Tax Benefits [Line Items]      
Begining Balance 21,393 $ 23,443 $ 17,648
Additions based on tax positions related to the current year 2,050   4,853
Settlement and lapse of statute of limitations     (1,108)
Ending Balance $ 23,443   $ 21,393