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Investment in Unconsolidated Subsidiary (Details) (USD $)
3 Months Ended 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Dec. 29, 2012
Mar. 30, 2013
Diamond Green Diesel Holdings LLC Joint Venture [Member]
boe
Mar. 31, 2012
Diamond Green Diesel Holdings LLC Joint Venture [Member]
Jan. 21, 2011
Diamond Green Diesel Holdings LLC Joint Venture [Member]
Jan. 21, 2011
Diamond Green Diesel Holdings LLC Joint Venture [Member]
Valero Energy Corporation [Member]
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage           50.00% 50.00%
Joint Venture Potential Barrels Of Fuel Per Day       9,300      
Line of Credit Facility, Term       14 years      
Term loan facility       $ 221,300,000      
Equity method investment committed contribution amount       93,200,000      
Equity method investment estimated aggregate cost of completion of facility       407,700,000      
Equity Method Investment Percentage Required to Pay for Cost Overruns       50.00%      
Joint Venture Estimated Project Scope Changes       19,800,000      
Investment in the joint venture 73,835,000   62,495,000 73,800,000      
Loss from equity method investments $ 1,195,000 $ 236,000   $ 1,200,000 $ 200,000