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Schedule of Other Changes in Plan Assets and Benefit Obligation Recognized (Detail) - USD ($)
$ in Thousands
 4 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Pension Plans, Defined Benefit      
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]      
Net (gain) loss   $ 1,939  
Total recognized in other comprehensive (income) loss, before tax   1,939  
Net of tax   1,939  
Other Pension Plans, Defined Benefit      
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]      
Net (gain) loss   325  
Prior service (cost) credit   (1,861)  
Total recognized in other comprehensive (income) loss, before tax   (1,536)  
Net of tax   $ (1,536)  
Predecessor | Pension Plans, Defined Benefit      
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]      
Net (gain) loss $ 1,877   $ 3,821
Fresh-start accounting fair value adjustment (22,333)    
Amortization of net (loss) gain (748)   (1,785)
Total recognized in other comprehensive (income) loss, before tax (21,204)   2,036
Net of tax (21,204)   1,323
Predecessor | Other Pension Plans, Defined Benefit      
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]      
Net (gain) loss 207   (285)
Amortization of prior service (cost) credit 927   4,346
Fresh-start accounting fair value adjustment 19,055    
Amortization of net (loss) gain 335   1,138
Total recognized in other comprehensive (income) loss, before tax 20,524   5,199
Net of tax $ 20,524   $ 3,379