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Schedule of Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
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  
Predecessor    
Schedule Of Pension Plans With Accumulated And Projected Benefit Obligations In Excess Of Plan Assets [Line Items]    
Projected benefit obligation   $ 97,941
Accumulated benefit obligation   94,467
Fair value of plan assets   $ 57,146