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Long-Lived Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Property, Plant and Equipment [Line Items]    
Gross property and equipment $ 725,104 $ 632,332
Less accumulated depreciation (289,503) (268,913)
Net property and equipment 435,601 363,419
Automated Storage And Retrieval Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Gross property and equipment 61,371 50,731
Depreciable life in years 15  
Land [Member]
   
Property, Plant and Equipment [Line Items]    
Gross property and equipment 31,350 28,771
Buildings And Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Gross property and equipment 172,372 161,444
Depreciable life in years, minimum 31  
Depreciable life in years, maximum 40  
Equipment And Shelving [Member]
   
Property, Plant and Equipment [Line Items]    
Gross property and equipment 339,471 303,656
Depreciable life in years, minimum 3  
Depreciable life in years, maximum 10  
Transportation Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Gross property and equipment 49,074 41,171
Depreciable life in years, minimum 3  
Depreciable life in years, maximum 5  
Construction In Progress [Member]
   
Property, Plant and Equipment [Line Items]    
Gross property and equipment $ 71,466 $ 46,559