Contingencies (Details) $ in Millions	Mar. 31, 2016 USD ($) lawsuit
Contingencies
Number of lawsuits \| lawsuit	2
Additional accounts receivable \| $	$ 43.0

Amount the entity estimates it is due from a customer in excess of the amount paid by the customer.

No definition available.

Name:	ar_AdditionalAccountsReceivable
Namespace Prefix:	ar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant