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Summary of Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended |
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Oct. 02, 2010 | Dec. 31, 2012 item | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Minimum | Dec. 31, 2012 Maximum | Dec. 31, 2012 PS International item | Dec. 30, 2012 PS International North Carolina | Jan. 02, 2012 PS International North Carolina | Jan. 28, 2012 PS International North Carolina | Dec. 31, 2012 PS International North Carolina | Apr. 03, 2010 PS International North Carolina
Operations of Seaboard Corporation and its Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest held by Seaboard Flour LLC and SFC Preferred LLC (Parent Companies) |  | 74.60% |  |  |  |  |  |  |  |  |  |
Principles of Consolidation and Investments in Affiliates |  |  |  |  |  |  |  |  |  |  |  |
Time lag for reporting financial information of certain foreign subsidiaries and affiliates |  |  |  |  | 1 month | 3 months |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |
Useful Lives |  |  |  |  | 3 years | 30 years |  |  |  |  |  |
Deferred Grants |  |  |  |  |  |  |  |  |  |  |  |
Deferred Grants |  | $ 5,231,000 | $ 5,631,000 |  |  |  |  |  |  |  |  |
Changes in the asset retirement obligation |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 13,109,000 | 12,028,000 |  |  |  |  |  |  |  |  |
Accretion Expense |  | 1,090,000 | 1,007,000 |  |  |  |  |  |  |  |  |
Liability for additional lagoons placed in service |  | 116,000 | 74,000 |  |  |  |  |  |  |  |  |
Ending balance |  | 14,315,000 | 13,109,000 | 12,028,000 |  |  |  |  |  |  |  |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |
Interest (net of amounts capitalized) |  | 11,674,000 | 6,786,000 | 8,377,000 |  |  |  |  |  |  |  |
Income taxes (net of refunds) |  | 69,760,000 | 126,730,000 | 69,626,000 |  |  |  |  |  |  |  |
Capitalized interest |  | 1,125,000 | 6,723,000 | 3,350,000 |  |  |  |  |  |  |  |
Supplemental Non-Cash Transactions |  |  |  |  |  |  |  |  |  |  |  |
Non-cash, pay-in-kind interest income and accretion of discount recognized on a note receivable from an affiliate |  | 11,936,000 | 10,584,000 | 695,000 |  |  |  |  |  |  |  |
Total cash paid, net of cash acquired | 5,578,000 | 3,186,000 |  | 5,578,000 |  |  |  |  |  |  |  |
Number of transactions for acquiring interest in subsidiaries |  |  |  |  |  |  | 2 |  |  |  |  |
Payment to increase ownership interest in affiliate |  |  |  |  |  |  |  | 3,045,000 | 3,186,000 |  |  |
Increase in working capital | 1,254,000 |  |  |  |  |  |  |  | 14,209,000 |  |  |
Increase in fixed assets | 4,637,000 |  |  |  |  |  |  |  | 163,000 |  |  |
Increase in goodwill |  |  |  |  |  |  |  |  | 2,590,000 |  |  |
Increase in intangible assets |  |  |  |  |  |  |  |  | 1,441,000 |  |  |
Increase in other long-term assets | 833,000 |  |  |  |  |  |  |  | 96,000 |  |  |
Increase in deferred tax liabilities | 896,000 |  |  |  |  |  |  |  |  |  |  |
Increase in non-controlling interest | 250,000 |  |  |  |  |  |  |  | 2,853,000 |  |  |
Decrease in investments in and advances to affiliates |  |  |  |  |  |  |  |  | $ 9,415,000 |  |  |
Percentage ownership acquired |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Ownership after increase (as a percent) |  |  |  |  |  |  |  |  |  | 70.00% | 85.00% |
Foreign Currency Transactions and Translation |  |  |  |  |  |  |  |  |  |  |  |
Number of non-controlled, non-consolidated affiliates using local currency as their functional currency |  | 7 |  |  |  |  |  |  |  |  |  |

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