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Schedule of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Sep. 30, 2018
Jul. 31, 2017
Sep. 30, 2018
Pension Benefits          
Net Period Benefit Cost Assumptions [Line Items]          
Service cost   $ 203 $ 47   $ 118
Interest cost   624 872   2,656
Expected return on plan assets   (332) (481)   (1,446)
Administrative expenses   2 3   6
Settlement loss recognized         335
Net periodic pension cost   497 441   1,669
Pension Benefits | Predecessor          
Net Period Benefit Cost Assumptions [Line Items]          
Service cost $ 99     $ 812  
Interest cost 328     2,304  
Expected return on plan assets (173)     (1,292)  
Administrative expenses 1     25  
Payroll tax of net pension costs       56  
Amortization of net actuarial losses       32  
Recognized actuarial (benefit) loss 187     1,195  
Net periodic pension cost 442     3,132  
Other Benefits          
Net Period Benefit Cost Assumptions [Line Items]          
Service cost   12 15   45
Interest cost   30 29   88
Amortization of prior service cost     (75)   (224)
Recognized actuarial (benefit) loss     11   32
Net periodic pension cost   $ 42 $ (20)   $ (59)
Other Benefits | Predecessor          
Net Period Benefit Cost Assumptions [Line Items]          
Service cost 6     44  
Interest cost 16     115  
Amortization of prior service cost (232)     (2,015)  
Recognized actuarial (benefit) loss (83)     (618)  
Net periodic pension cost $ (293)     $ (2,474)