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INVESTMENTS AND DEPOSITS (Details) - Schedule of Financial information For Equity Method Investment (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Patriot [Member] |  |  |
INVESTMENTS AND DEPOSITS (Details) - Schedule of Financial information For Equity Method Investment [Line Items] |  |  |
Net sales and revenue | $ 331,260 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember | $ 377,532 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember | $ 365,302 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember
Gross profit | 59,980 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember | 37,411 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember | 7,685 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember
Income from continuing operations | 52,875 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember | 31,518 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember | 1,320 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember
Net income | 52,875 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember | 31,518 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember | 1,320 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_PatriotMember
Big River [Member] |  |  |
INVESTMENTS AND DEPOSITS (Details) - Schedule of Financial information For Equity Method Investment [Line Items] |  |  |
Net sales and revenue | 1,184,505 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember | 1,292,120 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember | 1,135,956 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember
Gross profit | 241,963 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember | 124,327 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember | 20,651 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember
Income from continuing operations | 187,388 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember | 90,729 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember | 2,799 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember
Net income | $ 187,388 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember | $ 90,729 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember | $ 2,799 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_BigRiverMember

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- Definition The amount of gross profit (loss) reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 + Details
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- Definition The amount of income (loss) from continuing operations before extraordinary items reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33908-111571 + Details
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- Definition The amount of net income (loss) reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 + Details
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