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Change in Plan Assets and Obligations (Detail) - USD ($)
$ in Thousands
 4 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]        
Benefit obligation at end of the period   $ 103,443 $ 103,443  
Fair value of plan assets at end of the period   57,536 57,536  
Predecessor        
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]        
Benefit obligation at end of the period       $ 97,941
Fair value of plan assets at end of the period       57,146
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   (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    
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   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 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
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]        
Actuarial (gain) loss   (217)    
Fair value of plan assets at beginning of the period   58,148    
Actual return   1,182    
Expected return   32    
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   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)    
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]        
Actuarial (gain) loss (109)     (148)
Fair value of plan assets at beginning of the period 57,146   57,146 57,174
Actual return 2,138     577
Expected return 16     51
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
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    
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   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 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
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)    
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)