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Change in Plan Assets and Obligations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jul. 31, 2017
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Benefit obligation at beginning of the period         $ 103,443        
Benefit obligation at end of the period       $ 103,443     $ 103,443    
Predecessor                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Benefit obligation at beginning of the period   $ 97,941 $ 97,941       97,941    
Benefit obligation at end of the period               $ 97,941  
Pension Plans, Defined Benefit                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Employer contributions $ 0 0     0 $ 0 0 3,000 $ 0
Current liabilities       (10,731)     (10,731)    
Noncurrent liabilities       (35,252)     (35,252)    
Net amount recognized       (45,983)     (45,983)    
Pension Plans, Defined Benefit | Predecessor                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Actuarial (gain) loss     748         1,785  
Current liabilities     (1,791)         (1,791)  
Noncurrent liabilities     (41,642)         (39,087)  
Net amount recognized     (43,433)         (40,878)  
Pension Plans, Defined Benefit | Change in Benefit Obligations                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Benefit obligation at beginning of the period       101,490 103,443        
Service cost       546          
Interest cost       1,599          
Plan curtailment       (432)          
Benefits paid       (2,059)          
Actuarial (gain) loss       2,322          
Foreign currency exchange rate changes       (23)          
Benefit obligation at end of the period     101,490 103,443     103,443    
Pension Plans, Defined Benefit | Change in Benefit Obligations | Predecessor                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Benefit obligation at beginning of the period   97,941 97,941 101,490     97,941 95,830  
Service cost     393         1,182  
Interest cost     1,313         3,814  
Benefits paid     (1,610)         (4,895)  
Actuarial (gain) loss     3,322         2,082  
Foreign currency exchange rate changes     131         (72)  
Benefit obligation at end of the period     101,490         97,941 95,830
Pension Plans, Defined Benefit | Change In Plan Assets                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Fair value of plan assets at beginning of the period       58,148 57,536        
Actual return       1,182          
Expected return       32          
Actuarial (gain) loss       217          
Administrative expenses       (15)          
Plan curtailment       (100)          
Employer contributions       625          
Benefits paid       (2,059)          
Foreign currency exchange rate changes       (60)          
Fair value of plan assets at end of the period     58,148 57,536     57,536    
Payroll tax unrecognized in benefit obligation at end of the period       76     76    
Unfunded status at end of the period       (45,983)     (45,983)    
Pension Plans, Defined Benefit | Change In Plan Assets | Predecessor                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Fair value of plan assets at beginning of the period   57,146 57,146 58,148     57,146 57,174  
Actual return     2,138         577  
Expected return     16         51  
Actuarial (gain) loss     109         148  
Administrative expenses     (7)         (27)  
Employer contributions     435         4,465  
Benefits paid     (1,610)         (4,895)  
Foreign currency exchange rate changes     139         (51)  
Fair value of plan assets at end of the period     58,148         57,146 57,174
Payroll tax unrecognized in benefit obligation at end of the period     91         83  
Unfunded status at end of the period     (43,433)         (40,878)  
Other Pension Plans, Defined Benefit                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Current liabilities       (282)     (282)    
Noncurrent liabilities       (2,642)     (2,642)    
Net amount recognized       (2,924)     (2,924)    
Other Pension Plans, Defined Benefit | Predecessor                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Actuarial (gain) loss     (335)         (1,138)  
Current liabilities     (418)         (418)  
Noncurrent liabilities     (4,399)         (4,393)  
Net amount recognized     (4,817)         (4,811)  
Other Pension Plans, Defined Benefit | Change in Benefit Obligations                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Benefit obligation at beginning of the period       4,817 $ 2,924        
Service cost       29          
Interest cost       75          
Participant contributions       65          
Plan amendment       (1,861)          
Benefits paid       (526)          
Actuarial (gain) loss       325          
Benefit obligation at end of the period     4,817 2,924     2,924    
Other Pension Plans, Defined Benefit | Change in Benefit Obligations | Predecessor                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Benefit obligation at beginning of the period   $ 4,811 4,811 4,817     4,811 5,573  
Service cost     23         81  
Interest cost     64         201  
Participant contributions     58         411  
Benefits paid     (346)         (1,170)  
Actuarial (gain) loss     207         (285)  
Benefit obligation at end of the period     4,817         4,811 $ 5,573
Other Pension Plans, Defined Benefit | Change In Plan Assets                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Employer contributions       461          
Participant contributions       65          
Benefits paid       (526)          
Unfunded status at end of the period       $ (2,924)     $ (2,924)    
Other Pension Plans, Defined Benefit | Change In Plan Assets | Predecessor                  
Schedule Of Pension And Other Postretirement Benefits Changes In Benefit Obligation And Fair Value Of Plan Assets [Line Items]                  
Employer contributions     288         759  
Participant contributions     58         411  
Benefits paid     (346)         (1,170)  
Unfunded status at end of the period     $ (4,817)         $ (4,811)