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Investment in Unconsolidated Subsidiary (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 | Jun. 30, 2012 | Dec. 29, 2012 | Jun. 29, 2013 Diamond Green Diesel Holdings LLC Joint Venture [Member] boe | Jun. 30, 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 |  |  |
Darling's total contributions for constructing and funding Joint Venture |  |  |  |  |  | 111,700,000 |  |  |
Investment in the joint venture | 104,297,000 |  | 104,297,000 |  | 62,495,000 | 104,300,000 |  |  |
Loss from equity method investments | $ 1,962,000 | $ 656,000 | $ 3,157,000 | $ 892,000 |  | $ 3,200,000 | $ 900,000 |  |

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