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Certain Information Regarding Health and Welfare Plan (Detail) - Post-Retirement Benefits - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligation:      
Benefit obligation at beginning of year $ 13,583 $ 16,349  
Interest cost 512 513 $ 577
Actuarial gain (1,233) (2,248)  
Premiums and claims paid (964) (1,031)  
Benefit obligation at end of year 11,898 13,583 $ 16,349
Change in Plan Assets:      
Employer contribution 964 1,031  
Premiums and claims paid (964) (1,031)  
Funded status (included in "Other liabilities") (11,898) (13,583)  
Changes recognized in other comprehensive income for the year ended December 31:      
Amortization of prior service cost 249 249  
Amortization of actuarial gain (124) (309)  
Net actuarial (gain) loss arising during the year (1,234) (2,248)  
Total recognized in other comprehensive income for the year (pre-tax) (1,109) (2,308)  
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31:      
Prior service cost (536) (785)  
Actuarial loss, net 1,466 2,823  
Total accumulated other comprehensive income (pre-tax) $ 930 $ 2,038