SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) (USD $)	3 Months Ended
Sep. 30, 2014
Product Information [Line Items]
Common Stock Subject to Forfeiture	375,000
Federal Depository Insurance Coverage	$ 250,000

This element refers to federal depository insurance coverage.

No definition available.

Name:	hdrau_FederalDepositoryInsuranceCoverage
Namespace Prefix:	hdrau_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration