CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Dec. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
Proceeds from sale of interest in unevaluated oil and gas properties, transaction costs	$ 257

Represents the transaction costs on sale of interest in unevaluated oil and gas property and equipment.

No definition available.

Name:	hdy_TransactionCostsOnSaleOfInterestInUnevaluatedOilAndGasPropertyAndEquipment
Namespace Prefix:	hdy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration