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Other Amounts Recognized in Other Comprehensive Income (Loss) (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]      
Net loss (gain) $ 43,207 $ (19,216) $ 2,413
Prior service cost (credit) (2,776) (183)  
Amortization of prior service (cost) credit (1,193) (1,205) (1,446)
Amortization of actuarial loss (8,382) (8,671) (6,843)
Total recognized in other comprehensive loss (income) 30,856 (29,275) (5,876)
Total recognized in net periodic cost (benefit) and other comprehensive loss (income) 46,492 (15,214) 4,906
OTHER POSTRETIREMENT EMPLOYEE BENEFIT PLANS
      
Defined Benefit Plan Disclosure [Line Items]      
Net loss (gain) (5,435) (9,471) 8,645
Amortization of prior service (cost) credit 1,795 1,795 2,112
Amortization of actuarial loss   (2,083) (3,549)
Total recognized in other comprehensive loss (income) (3,640) (9,759) 7,208
Total recognized in net periodic cost (benefit) and other comprehensive loss (income) $ 2,124 $ (764) $ 18,059