Inventories (Details) $ in Thousands, bu in Millions	Sep. 30, 2016 USD ($) bu	Dec. 31, 2015 USD ($) bu	Sep. 30, 2015 USD ($) bu
Inventory, Net [Abstract]
Grain	$ 262,165	$ 534,548	$ 325,536
Ethanol and by-products	7,734	8,576	8,365
Plant nutrients and cob products	126,922	172,815	161,562
Retail merchandise	24,985	24,510	26,079
Railcar repair parts	5,948	6,894	6,057
Other	0	56	190
Total inventories	$ 427,754	$ 747,399	$ 527,789
Bushels of grain held in storage and excluded from inventory calculations \| bu	1.0	3.4	3.2

Grain Held in Storage, Excluded from Inventory Calculations

No definition available.

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Period Type:	instant

- Definition

Railcar repair parts inventory.

+ References

No definition available.

+ Details

Name:	ande_RailcarRepairPartsInventory
Namespace Prefix:	ande_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of merchandise or supplies held which are related to plants and animals.

+ References

+ Details

Name:	us-gaap_AgriculturalRelatedInventory
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of products that are used in the growth of plant goods (examples would include seeds, soil, fertilizers and other products).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process.

+ References

+ Details

Name:	us-gaap_EnergyRelatedInventory
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=51655945&loc=d3e3927-108312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765

+ Details

Name:	us-gaap_InventoryNet
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_InventoryNetAbstract
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Balance Type:	na
Period Type:	duration

- Definition

Amount before valuation and LIFO reserves of other inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_OtherInventory
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of merchandise inventory purchased by a retailer, wholesaler or distributor and held for future sale.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant