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Condensed Statement of Changes in Stockholders' Equity (Parenthetical)	Sep. 30, 2014
Common Stock Subject to Forfeiture	375,000

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- Definition

Common stock subject to forfeiture.

+ References

No definition available.

+ Details

Name:	hdrau_CommonStockSubjectToForfeiture
Namespace Prefix:	hdrau_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant