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Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Accumulated Other Comprehensive Loss      
Cash flow hedges $ (29,118) $ (31,986) $ (32,785)
Pension and postretirement plans (175,605) (184,858) (132,158)
Total $ (204,723) $ (216,844) $ (164,943)