RELATED-PARTY TRANSACTIONS - Affliliate Royalty Agreements - SGP Land (Details) - SGP Land, LLC - MC Mining LLC - Mineral lease - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction
Annual minimum royalties	$ 0.3
Cumulative annual minimum and/or earned royalty payments	6.0
Payments for royalties	$ 0.6	$ 0.6	$ 1.9

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

No definition available.

Name:	ahgp_AnnualMinimumRoyalties
Namespace Prefix:	ahgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represent cumulative annual minimum and/or earned royalty required to be paid to the related party, per the terms of the agreement.

+ References

No definition available.

+ Details

Name:	ahgp_RelatedPartyCumulativeAnnualMinimumAndOrEarnedRoyaltyPayments
Namespace Prefix:	ahgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of cash paid for royalties during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

+ Details

Name:	us-gaap_PaymentsForRoyalties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ahgp_SpecialGeneralPartnerLandLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ahgp_McMiningLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=ahgp_MineralLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: