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Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts - USD ($)
$ in Thousands
 4 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Mar. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]        
Balance at Beginning of Period     $ 1,800  
Additions at Cost   $ 1,800 900  
Balance at End of Period   $ 1,800 $ 2,700  
Predecessor        
Valuation and Qualifying Accounts Disclosure [Line Items]        
Balance at Beginning of Period $ 16,165     $ 11,450
Additions at Cost       5,348
Deductions $ 16,165 [1]     633
Balance at End of Period       $ 16,165
[1] Approximately $15.4 million was deducted from the allowance for doubtful accounts in conjunction with the application of fresh-start accounting upon emergence from Chapter 11 bankruptcy