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Amounts Changed to Expense Related to Continue Plans (Detail) - USD ($)
$ in Thousands
4 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Multinational plan expense   $ 81  
Predecessor      
Defined Benefit Plan Disclosure [Line Items]      
Multinational plan expense $ 67   $ 260