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Pre-tax Components of Net Periodic Cost (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
PENSION BENEFIT PLANS
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 7,725 $ 8,018 $ 7,043
Interest cost 15,092 15,375 15,331
Expected return on plan assets (19,532) (19,391) (19,881)
Amortization of prior service cost (credit) 1,193 1,205 1,446
Amortization of actuarial loss 8,382 8,671 6,843
Curtailments 2,776 183  
Net periodic cost 15,636 14,061 10,782
OTHER POSTRETIREMENT EMPLOYEE BENEFIT PLANS
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 702 995 972
Interest cost 6,857 7,712 8,442
Amortization of prior service cost (credit) (1,795) (1,795) (2,112)
Amortization of actuarial loss   2,083 3,549
Net periodic cost $ 5,764 $ 8,995 $ 10,851