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Schedule of Net Periodic Benefit Cost (Detail) - Pension Benefits - USD ($)
$ in Thousands
 4 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Net Period Benefit Cost Assumptions [Line Items]      
Service cost   $ 546  
Interest cost   1,599  
Expected return on plan assets   (882)  
Administrational expenses   19  
Payroll tax of net pension costs   29  
Amortization of net actuarial losses   131  
Curtailment gain   (99)  
Net periodic pension cost   $ 1,343  
Predecessor      
Net Period Benefit Cost Assumptions [Line Items]      
Service cost $ 393   $ 1,182
Interest cost 1,313   3,814
Expected return on plan assets (691)   (2,246)
Administrational expenses 3   28
Payroll tax of net pension costs     56
Amortization of net actuarial losses     32
Recognized actuarial loss 748   1,785
Net periodic pension cost $ 1,766   $ 4,651