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Balance in Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Dec. 31, 2009
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Pension and postretirement plan net actuarial loss $ (110,918) $ (97,648)    
Pension and postretirement plan prior service credit 351 509    
Total (114,667) (112,047) (33,709) (64,672)
Commodity Derivative
       
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Accumulated other comprehensive income designated as cash flow hedges (2,528) (12,825)    
Interest rate swap derivatives
       
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Accumulated other comprehensive income designated as cash flow hedges $ (1,572) $ (2,083)