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Share-based compensation (Details) | Mar. 31, 2014 | May 11, 2010
--- | --- | ---
Equity and Incentive Plan (EIP) |  |
Share-based compensation |  |
Shares remaining available for future issuance | 3,200,000 |
Shares that can be issued upon vesting of outstanding units and achievement of performance goals | 2,900,000 |
Stock Option and Incentive Plan (SOIP) |  |
Share-based compensation |  |
Shares remaining available for future issuance | 1,000 | 0
Nonemployee Director Stock Plan (2011 Director Plan) |  |
Share-based compensation |  |
Shares remaining available for future issuance | 202,460 |

X
- Definition Represents the number of shares that could be issued upon vesting of share-based payment awards and achievement of performance goals. + References No definition available. + Details
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X
- Definition Represents the number of authorized but unissued shares that could be issued under the equity-based compensation plan. + References No definition available. + Details
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Namespace Prefix: | he_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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X
- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration