RELATED-PARTY TRANSACTIONS - WKY CoalPlay (Details) - Variable Interest Entity, Not Primary Beneficiary - WKY CoalPlay - USD ($) $ in Millions	1 Months Ended
Feb. 28, 2015	Dec. 31, 2014
Alliance Resource Properties \| February 2015 coal lease - Henderson and Union Counties, Kentucky
WKY COALPLAY
Initial term of lease	20 years
Percentage of earned royalty on coal sale price	4.00%
Annual minimum royalties	$ 2.1
Period for option to acquire the leased reserves	3 years
Percentage of internal rate of return on purchase price, if leased reserves acquired	7.00%
Alliance Resource Properties \| Towhead Coal \| December 2014 coal lease - Henderson and Union Counties, Kentucky
WKY COALPLAY
Initial term of lease		20 years
Annual minimum royalties		$ 3.6
Alliance Resource Properties \| Towhead Coal \| December 2014 coal lease - Webster County, Kentucky
WKY COALPLAY
Period for option to acquire the leased reserves		3 years
Percentage of internal rate of return on purchase price, if leased reserves acquired		7.00%
Alliance Resource Properties \| Towhead Coal \| December 2014 coal lease - Henderson County, Kentucky
WKY COALPLAY
Percentage of earned royalty on coal sale price		4.00%
Alliance Resource Properties \| Henderson Coal \| December 2014 coal lease - Henderson and Union Counties, Kentucky
WKY COALPLAY
Percentage of earned royalty on coal sale price		4.00%
Annual minimum royalties		$ 2.5
Alliance Resource Properties \| Henderson Coal \| December 2014 coal lease - Henderson County, Kentucky
WKY COALPLAY
Initial term of lease		20 years
Period for option to acquire the leased reserves		3 years
Percentage of internal rate of return on purchase price, if leased reserves acquired		7.00%
Alliance Resource Properties \| Webster Coal \| December 2014 coal lease - Henderson and Union Counties, Kentucky
WKY COALPLAY
Period for option to acquire the leased reserves		3 years
Percentage of internal rate of return on purchase price, if leased reserves acquired		7.00%
Alliance Resource Properties \| Webster Coal \| December 2014 coal lease - Webster County, Kentucky
WKY COALPLAY
Initial term of lease		7 years
Percentage of earned royalty on coal sale price		4.00%
Annual minimum royalties		$ 2.6

The minimum amount of royalties to be paid annually to the related party, per the terms of the agreement.

No definition available.

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- Definition

Term of lessee's lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Excludes operating, finance and capital lease obligations.

+ References

No definition available.

+ Details

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- Definition

The percentage of earned royalty on the coal sales price provided to the counterparty under the lease agreement.

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No definition available.

+ Details

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- Definition

Percentage of internal rate of return provided to the counterparty in the purchase price under the option to acquire the leased coal reserves.

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No definition available.

+ Details

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- Definition

Period following a specified date, within which the entity has the option to acquire the coal reserves under the lease agreement.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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