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Summary of Information on Plans' Assets, Projected Benefit Obligations (PBO), and Funded Status (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plans
      
Schedule of Defined Benefit Plan Change in Benefit Obligation [Line Items]      
Service Cost $ 3,573,000 $ 3,227,000 $ 2,941,000
Interest Cost 4,567,000 4,633,000 4,684,000
Funded Status: Assets vs PBO (25,744,000) (44,081,000)  
Pension Plans | Change in Plan Assets
      
Schedule of Defined Benefit Plan Change in Benefit Obligation [Line Items]      
Plan Assets at Beginning of Year 72,411,000 59,700,000  
Actual Return on Plan Assets 10,204,000 7,780,000  
Employer Contributions 3,700,000 9,387,000  
Acquired Plan Assets        
Benefits Paid (3,764,000) (4,456,000)  
Plan Assets at End of Year 82,551,000 72,411,000  
Pension Plans | Change In Projected Benefit Obligation
      
Schedule of Defined Benefit Plan Change in Benefit Obligation [Line Items]      
PBO at Beginning of Year 116,492,000 102,719,000  
Service Cost 3,573,000 3,227,000  
Interest Cost 4,567,000 4,633,000  
Plan Amendments   617,000  
Benefits Paid (3,764,000) (4,456,000)  
Actuarial (Gain) or Loss (12,573,000) 9,752,000  
PBO at End of Year 108,295,000 116,492,000  
Other Postretirement Benefit Plans, Defined Benefit
      
Schedule of Defined Benefit Plan Change in Benefit Obligation [Line Items]      
Service Cost 2,523,000 2,066,000 1,918,000
Interest Cost 2,448,000 2,303,000 2,279,000
Employer Contributions 3,280,000 2,190,000  
Participant Contributions 36,000 18,000 13,000
Benefits Paid (1,942,000) (2,083,000) (1,644,000)
Funded Status: Assets vs PBO (46,070,000) (53,791,000)  
Other Postretirement Benefit Plans, Defined Benefit | Change in Plan Assets
      
Schedule of Defined Benefit Plan Change in Benefit Obligation [Line Items]      
Plan Assets at Beginning of Year 8,301,000 7,339,000  
Actual Return on Plan Assets 1,154,000 837,000  
Employer Contributions 3,280,000 2,190,000  
Participant Contributions 36,000 18,000  
Acquired Plan Assets        
Benefits Paid (1,942,000) (2,083,000)  
Plan Assets at End of Year 10,829,000 8,301,000  
Other Postretirement Benefit Plans, Defined Benefit | Change In Projected Benefit Obligation
      
Schedule of Defined Benefit Plan Change in Benefit Obligation [Line Items]      
PBO at Beginning of Year 62,092,000 50,930,000  
Service Cost 2,523,000 2,066,000  
Interest Cost 2,448,000 2,303,000  
Participant Contributions 36,000 18,000  
Plan Amendments (183,000) (318,000)  
Benefits Paid (1,942,000) (2,083,000)  
Actuarial (Gain) or Loss (8,075,000) 9,176,000  
PBO at End of Year 56,899,000 62,092,000  
Supplemental Employee Retirement Plans, Defined Benefit
      
Schedule of Defined Benefit Plan Change in Benefit Obligation [Line Items]      
Service Cost 73,000 289,000 285,000
Interest Cost 241,000 211,000 227,000
Employer Contributions 53,000 53,000 53,000
Benefits Paid (53,000) (53,000) (53,000)
Funded Status: Assets vs PBO (5,857,000) (6,207,000)  
Supplemental Employee Retirement Plans, Defined Benefit | Change in Plan Assets
      
Schedule of Defined Benefit Plan Change in Benefit Obligation [Line Items]      
Employer Contributions 53,000 53,000  
Acquired Plan Assets        
Benefits Paid (53,000) (53,000)  
Supplemental Employee Retirement Plans, Defined Benefit | Change In Projected Benefit Obligation
      
Schedule of Defined Benefit Plan Change in Benefit Obligation [Line Items]      
PBO at Beginning of Year 6,207,000 4,615,000  
Service Cost 73,000 289,000  
Interest Cost 241,000 211,000  
Benefits Paid (53,000) (53,000)  
Actuarial (Gain) or Loss (611,000) 1,145,000  
PBO at End of Year $ 5,857,000 $ 6,207,000