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Certain Information Regarding Health and Welfare Plan (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in Plan Assets:      
Fair value of assets at end of year $ 210,246    
Post-Retirement Benefits      
Change in benefit obligation:      
Benefit obligation at beginning of year 16,349 $ 16,294  
Interest cost 513 577 $ 639
Actuarial (gain) loss (2,248) 517  
Premiums and claims paid (1,031) (1,039)  
Benefit obligation at end of year 13,583 16,349 16,294
Change in Plan Assets:      
Fair value of assets at beginning of year 0 0  
Employer contribution 1,031 1,039  
Premiums and claims paid (1,031) (1,039)  
Fair value of assets at end of year 0 0 $ 0
Funded status (included in "Other liabilities") (13,583) (16,349)  
Changes recognized in other comprehensive (loss) income for the year ended December 31:      
Amortization of prior service cost 249 249  
Amortization of actuarial gain (309) (274)  
Net actuarial (gain) loss arising during the year (2,248) 517  
Total recognized in other comprehensive loss for the year (pre-tax) (2,308) 492  
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31:      
Prior service cost (785) (1,034)  
Actuarial loss, net 2,823 5,380  
Total accumulated other comprehensive loss (pre-tax) $ 2,038 $ 4,346