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Business Acquisitions (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Oct. 11, 2012
Snack Factory, LLC [Member]
   
Business Acquisition [Line Items]    
Cash paid for acquisition   $ 343,400,000
Pro forma net revenue 413,988,000  
Pro forma income before interest and income taxes 26,849,000  
Pro forma net income attributable to Snyder's-Lance, Inc. 13,962,000  
Pro forma weighted average diluted shares 69,053  
Pro forma diluted earnings per share (in dollars per share) $ 0.20  
Selling, General and Administrative Expenses [Member] | Merger And Integration Activities [Member]
   
Business Acquisition [Line Items]    
Severance costs and professional fees $ 1,500,000