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INVESTMENTS IN EQUITY METHOD INVESTEES (DETAILS) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
The Group's proportionate share of equity in the net assets of equity investees	$ 8	$ 8
Less: Accumulated impairment losses recognized	(8)	(8)
Investments in equity investees reported in the consolidated balance sheet	$ 0	$ 0

X

- Definition

Accumulated impairment losses recognized in the net asset of equity investees

+ References

No definition available.

+ Details

Name:	hiho_AccumulatedImpairmentLossesRecognized
Namespace Prefix:	hiho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

It represents the group's equity interest in the net assets of equity investees as on date.

+ References

No definition available.

+ Details

Name:	hiho_GroupsProportionateShareOfEquityInNetAssetsOfEquityInvestees
Namespace Prefix:	hiho_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570

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Balance Type:	debit
Period Type:	instant