SUBSEQUENT EVENTS (Details) (Subsequent Event, USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended
Jul. 26, 2013
Subsequent Event
Distributions declared per unit	$ 0.785
Approximate distribution to be paid	$ 47.0
ARLP
Subsequent Event
Distributions declared per unit	$ 1.1525
Approximate distribution to be paid	$ 72.6

The equity impact of cash distributions declared to a common shareholder or unit-holder by a LLC or LP.

No definition available.

Name:	us-gaap_DistributionMadeToMemberOrLimitedPartnerCashDistributionsDeclared
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration