Contract Termination and Rig Stacking (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2015
Contract Termination and Rig Stacking Line Items
Contract termination and rig stacking	$ 1,937	$ 10,902

Represents costs incurred for the buy-back and termination of firm contracts and the delay or cancelation of drilling contracts with third-party contractors.

No definition available.

Name:	ar_ContractTerminationAndRigStacking
Namespace Prefix:	ar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration