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Retirement Plan, Based on Measurement Date (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    
Pension Benefits      
Change in Benefit Obligation:      
Benefit obligation at beginning of year 151,411 $ 146,429  
Interest cost 5,085 5,616 $ 5,881
Actuarial (gain) loss (4,676) 8,267  
Annuity payments (6,453) (6,485)  
Settlements (2,132) (2,416)  
Benefit obligation at end of year 143,235 151,411 146,429
Change in Plan Assets:      
Fair value of assets at beginning of year 234,136 220,740  
Actual (loss) return on plan assets (15,305) 22,297  
Contributions 0 0  
Annuity payments (6,453) (6,485)  
Settlements (2,132) (2,416)  
Fair value of assets at end of year 210,246 234,136 $ 220,740
Funded status (included in "Other assets") 67,011 82,725  
Changes recognized in other comprehensive income (loss) for the year ended December 31:      
Amortization of prior service cost 0 0  
Amortization of actuarial loss (7,179) (8,209)  
Net actuarial loss arising during the year 26,768 2,260  
Total recognized in other comprehensive income (loss) for the year (pre-tax) 19,589 (5,949)  
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31:      
Prior service cost 0 0  
Actuarial loss, net 93,180 73,591  
Total accumulated other comprehensive loss (pre-tax) $ 93,180 $ 73,591