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Schedule of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Pension Benefits        
Net Period Benefit Cost Assumptions [Line Items]        
Service cost $ 41   $ 71  
Interest cost 882   1,784  
Expected return on plan assets (482)   (964)  
Administrative expenses 2   3  
Settlement loss recognized 335   335  
Net periodic pension cost 778   1,229  
Pension Benefits | Predecessor        
Net Period Benefit Cost Assumptions [Line Items]        
Service cost   $ 294   $ 713
Interest cost   984   1,975
Expected return on plan assets   (518)   (1,119)
Administrative expenses   2   24
Payroll tax of net pension costs       56
Amortization of net actuarial losses       32
Recognized actuarial (benefit) loss   561   1,008
Net periodic pension cost   1,323   2,689
Other Benefits        
Net Period Benefit Cost Assumptions [Line Items]        
Service cost 15   30  
Interest cost 29   58  
Amortization of prior service cost (75)   (150)  
Recognized actuarial (benefit) loss 11   22  
Net periodic pension cost $ (20)   $ (40)  
Other Benefits | Predecessor        
Net Period Benefit Cost Assumptions [Line Items]        
Service cost   17   38
Interest cost   48   99
Amortization of prior service cost   (695)   (1,783)
Recognized actuarial (benefit) loss   (252)   (535)
Net periodic pension cost   $ (882)   $ (2,181)