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Employee Benefits - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Common stock held in employer stock fund 561,551 588,656 583,256
Total Company expenses under the health plan $ 2,250,000 $ 3,490,000 $ 2,980,000
Deferred Compensation Liability 459,000 463,000  
Deferred compensation Expense 60,000 60,000 60,000
Supplemental Executive Retirement Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan Maximum Employee Contribution As Percentage Of Base Salary 35.00%    
Defined Benefit Plan Accrued Benefit Cost Continuing Operations 5,620,000 5,110,000  
Defined Benefit Plan, Accrued Benefit Cost 535,000 519,000 424,000
Defined Benefit Plan, Employee Contribution, Age 62    
Defined benefit plan, actuarial obligation 5,620,000    
Supplemental Executive Retirement Plan | Before Amendment
      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, actuarial discount rate assumption 4.40%    
Supplemental Executive Retirement Plan | After Amendment
      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, actuarial discount rate assumption 4.20%    
Employees Four Zero One K Savings Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Employer Matching Contributions 1,270,000 1,340,000 1,120,000
Defined Contribution Plan Employer Contribution Percentage 100.00%    
Directors Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Accrued Benefit Cost 156,000 162,000 259,000
Defined Benefit Plan, Employee Contribution, Age 70    
Defined benefit plan, actuarial obligation 981,000    
Defined Contribution Plan Maximum Employee Contribution As Percentage Of Base Salary 100.00%    
Defined Benefit Plan Accrued Benefit Cost Continuing Operations 981,000 943,000  
Directors Plan | Before Amendment
      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, actuarial discount rate assumption 4.40%    
Directors Plan | After Amendment
      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, actuarial discount rate assumption 4.20%    
Individual Counterparty
      
Defined Benefit Plan Disclosure [Line Items]      
Stop Loss Insurance Liability 85,000    
Aggregate
      
Defined Benefit Plan Disclosure [Line Items]      
Stop Loss Insurance Liability $ 3,890,000