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Benefit Plans - Narrative (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 08, 2018
Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]    
Minimum eligibility for full-time employees, age   21 years
Number of highest-paid consecutive years for benefits   5 years
Amount contributed to pension plan $ 205  
Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Period of service credit by employee   1 year