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Schedule of Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Pension Plans With Accumulated And Projected Benefit Obligations In Excess Of Plan Assets [Line Items]    
Projected benefit obligation $ 90,247  
Accumulated benefit obligation 89,024  
Fair value of plan assets $ 56,790  
Predecessor    
Schedule Of Pension Plans With Accumulated And Projected Benefit Obligations In Excess Of Plan Assets [Line Items]    
Projected benefit obligation   $ 103,443
Accumulated benefit obligation   101,287
Fair value of plan assets   $ 57,536