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Goodwill and Intangible Assets (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]        
Amortization expense for intangible assets $ 5.0us-gaap_AmortizationOfIntangibleAssets $ 5.3us-gaap_AmortizationOfIntangibleAssets $ 4.8us-gaap_AmortizationOfIntangibleAssets  
Expected future annual amortization expense, 2015 4.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths     4.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Expected future annual amortization expense, 2016 3.9us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo     3.9us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Expected future annual amortization expense, 2017 3.3us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree     3.3us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Expected future annual amortization expense, 2018 3.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour     3.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Expected future annual amortization expense, 2019 2.6us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive     2.6us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Customer list | Grain        
Finite-Lived Intangible Assets [Line Items]        
Impairment recorded       $ 1.5us-gaap_GoodwillImpairmentLoss
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ande_GrainMember