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Business Acquisition (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 0 Months Ended 12 Months Ended
Mar. 31, 2015
business
Oct. 07, 2014
Dec. 31, 2014
Business Acquisition [Line Items]      
Number of business acquisitions 0us-gaap_NumberOfBusinessesAcquired    
Auburn Bean and Grain      
Business Acquisition [Line Items]      
Percentage of shares outstanding acquired   100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
 
Number of transactions   2ande_BusinessAcquisitionNumberofTransactions
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
 
Cash payments to acquire businesses   $ 5.0us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
 
Shares issued in connection with business acquisition, adjustment to working capital, shares   80ande_BusinessAcquisitionEquityInterestIssuedorIssuableNumberofSharesAdjustmenttoWorkingCapital
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
 
Shares issued in connection with business acquisition, adjustment to working capital, value   4.5ande_BusinessAcquisitionEquityInterestIssuedorIssuableAdjustmenttoWorkingCapitalValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
 
Cash paid to acquire additional facilities   20.4ande_BusinessCombinationSeparatelyRecognizedTransactionsPaymentstoAcquireAdditionalAssets
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
 
Additional grain storage capacity acquired (bushels)   18,100,000ande_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedGrainStorageCapacity
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
 
Dry grain storage acquired (tons)   16,000ande_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedGrainStorageCapacityDry
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
 
Grain storage acquired, liquid nutrient capacity (gallons)   3,700,000ande_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedGrainStorageCapacityLiquidNutrient
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
 
Purchase price   60.9us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
 
Series of business acquisitions      
Business Acquisition [Line Items]      
Purchase price     7.2us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
Grain operations | Auburn Bean and Grain      
Business Acquisition [Line Items]      
Number of locations acquired   6ande_NumberofLocationsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ande_GrainOperationsMember
 
Agronomy operations | Auburn Bean and Grain      
Business Acquisition [Line Items]      
Number of locations acquired   4ande_NumberofLocationsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ande_AgronomyOperationsMember
 
Number of shares issued as part of acquisition   637us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ande_AgronomyOperationsMember
 
Shares issued in connection with business acquisition, value   $ 35.5us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= ande_AuburnBeanandGrainMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ande_AgronomyOperationsMember