SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Pension Benefits (Details) - Pension Plan	12 Months Ended
Dec. 31, 2015
Employee Benefit Plans
Period of average annual total return used as basis for expected long-term rate of return	20 years
Threshold for amortization of unrecognized actuarial gains and losses (as a percent)	10.00%

Unrecognized actuarial gains and losses as a percentage of the greater of the benefit obligation or the market-related value of plan assets, above which such gains and losses are amortized over the participants' average remaining future years of service.

No definition available.

Name:	ahgp_ThresholdPercentageForAmortizationOfUnrecognizedActuarialGainsAndLosses
Namespace Prefix:	ahgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration