CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
NET INCOME	$ 103,573		$ 93,881		$ 205,957		$ 176,367
OTHER COMPREHENSIVE INCOME:
Total adjustments	726		679		1,453		1,303
TOTAL COMPREHENSIVE INCOME	104,299		94,560		207,410		177,670
Less: Comprehensive income attributable to noncontrolling interest	(43,008)		(39,902)		(85,762)		(73,383)
COMPREHENSIVE INCOME ATTRIBUTABLE TO AHGP	61,291		54,658		121,648		104,287
Defined benefit pension plan
OTHER COMPREHENSIVE INCOME:
Amortization of actuarial loss	559	[1]	485	[1]	1,118	[1]	915	[1]
Total adjustments	559		485		1,118		915
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME:
Amortization of actuarial loss	167	[1]	194	[1]	335	[1]	388	[1]
Total adjustments	$ 167		$ 194		$ 335		$ 388

[1] Amortization of actuarial loss is included in the computation of net periodic benefit cost (see Notes 9 and 11 for additional details).