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Changes in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans (Detail) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
PENSION BENEFIT PLANS
      
Benefit obligation      
Benefit obligation at beginning of year $ 272,012,000 $ 278,405,000  
Service cost 7,725,000 8,018,000 7,043,000
Interest cost 15,092,000 15,374,000  
Plan amendments   (14,175,000)  
Mergers, sales, closures, special term benefits (422,000)    
Actuarial losses (gains) 28,552,000 (590,000)  
Benefits paid (15,301,000) (15,020,000)  
Benefit obligation at end of year 307,658,000 272,012,000 278,405,000
Fair value of plan assets      
Fair value of plan assets at beginning of year 216,650,000 182,477,000  
Spin-off adjustment   (628,000)  
Actual return on plan assets 4,456,000 24,470,000  
Employer contribution 12,752,000 25,351,000  
Benefits paid (15,301,000) (15,020,000)  
Fair value of plan assets at end of year 218,557,000 216,650,000 182,477,000
Funded status at end of year (89,101,000) (55,362,000)  
Amounts recognized in the Consolidated Balance Sheets:      
Current liabilities (264,000) (254,000)  
Noncurrent liabilities (88,837,000) (55,108,000)  
Net amount recognized (89,101,000) (55,362,000)  
OTHER POSTRETIREMENT EMPLOYEE BENEFIT PLANS
      
Benefit obligation      
Benefit obligation at beginning of year 141,519,000 150,441,000  
Service cost 702,000 995,000 972,000
Interest cost 6,857,000 7,712,000  
Actuarial losses (gains) (5,433,000) (9,468,000)  
Medicare Part D subsidies received 355,000 697,000  
Benefits paid (7,290,000) (8,858,000)  
Benefit obligation at end of year 136,710,000 141,519,000 150,441,000
Fair value of plan assets      
Fair value of plan assets at beginning of year 16,000 14,000  
Spin-off adjustment 2,000 2,000  
Benefits paid (7,290,000) (8,858,000)  
Fair value of plan assets at end of year 18,000 16,000 14,000
Funded status at end of year (136,692,000) (141,503,000)  
Amounts recognized in the Consolidated Balance Sheets:      
Current liabilities (9,597,000) (9,495,000)  
Noncurrent liabilities (127,095,000) (132,008,000)  
Net amount recognized $ (136,692,000) $ (141,503,000)