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Share-based compensation Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 01, 2014
Share-based compensation |  |  |  |
Income tax benefit (in dollars) | $ 3.4 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 2.8 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 2.4 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |
Equity and Incentive Plan (EIP) |  |  |  |
Share-based compensation |  |  |  |
Additional shares available for issuance |  |  |  | 1,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = he_EquityAndIncentivePlanMember
Shares remaining available for future issuance | 3,600,000 he_ShareBasedCompensationNumberOfSharesThatCouldBeIssuedUponVestingOfRestrictedStockUnitsAndLongTermIncentivePlans / us-gaap_PlanNameAxis = he_EquityAndIncentivePlanMember |  |  |
Shares that can be issued upon vesting of outstanding units and achievement of performance goals | 900,000 he_ShareBasedCompensationNumberOfSharesThatCouldBeIssuedUponVestingAndAchievementOfPerformanceGoals / us-gaap_PlanNameAxis = he_EquityAndIncentivePlanMember |  |  |
Stock Option and Incentive Plan (SOIP) |  |  |  |
Share-based compensation |  |  |  |
Outstanding shares | 17,000 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndOtherAwardsOutstandingNumber / us-gaap_PlanNameAxis = he_StockOptionAndIncentivePlanMember |  |  |
Period of time from grant date after which awards become unrestricted | 4 years |  |  |
Nonemployee Director Stock Plan |  |  |  |
Share-based compensation |  |  |  |
Shares remaining available for future issuance | 169,290 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = he_NonemployeeDirectorStockPlanMember |  |  |
Long-term incentive plan (LTIP) |  |  |  |
Share-based compensation |  |  |  |
Performance period | 3 years |  |  |
Exception to forfeiture, minimum requisite service period | 12 months |  |  |
Payout low end of range (as a percent) | 0.00%he_ShareBasedCompensationByShareBasedPaymentAwardPayoutLowOfRange / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanMember |  |  |
Payout high end of range (as a percent) | 200.00%he_ShareBasedCompensationByShareBasedPaymentAwardPayoutHighEndOfRange / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanMember |  |  |
Stock appreciation rights (SARs) |  |  |  |
Share-based compensation |  |  |  |
Intrinsic value of equity instruments other than options, vested | 0.6 he_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsAggregateIntrinsicValueVested / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |
Expired (in shares) | 0 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 0 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 4,000 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
Stock appreciation rights (SARs) | Stock Option and Incentive Plan (SOIP) |  |  |  |
Share-based compensation |  |  |  |
Percentage of award exercisable in installments | 25.00%he_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_PlanNameAxis = he_StockOptionAndIncentivePlanMember |  |  |
Period during which the award vests and becomes exercisable in installments | 4 years |  |  |
Period award expires if not exercised | 10 years |  |  |
Restricted shares |  |  |  |
Share-based compensation |  |  |  |
Fair value of vested stock (in dollars) | 0.1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 0.1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 0.9 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Income tax benefit (in dollars) |  |  | 0.2 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Shares vested | 4,503 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 4,502 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 37,802 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Restricted shares | Equity and Incentive Plan (EIP) |  |  |  |
Share-based compensation |  |  |  |
The number of equal annual increments for which the awards become unrestricted (in installments) | 4 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncrementsUponWhichRestrictedAwardsBecomeUnrestrictedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = he_EquityAndIncentivePlanMember |  |  |
Restricted stock units |  |  |  |
Share-based compensation |  |  |  |
Fair value of vested stock (in dollars) | 4.1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 3.7 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 0.7 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
Income tax benefit (in dollars) | 1.2 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 0.9 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 0.2 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
Unrecognized compensation cost | 4.4 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized | 2 years 5 months 24 days |  |  |
Shares vested | 144,702 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 118,885 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 25,728 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
LTIP linked to TRS |  |  |  |
Share-based compensation |  |  |  |
Fair value of vested stock (in dollars) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember | 2.2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember | 0.6 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember |
Income tax benefit (in dollars) | 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember | 0.9 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember | 0.2 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember |
Unrecognized compensation cost | 2.2 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember |  |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized | 1 year 6 months |  |  |
Shares vested | 70,189 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember | 87,753 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember | 35,397 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember |
Shares settled | 70,205 he_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsSettled / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember |  |  |
Expired (in shares) | 17,548 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpirationsInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanLinkedToTotalReturnToShareholdersMember |  |  |
LTIP awards linked to other performance conditions |  |  |  |
Share-based compensation |  |  |  |
Fair value of vested stock (in dollars) | 1.9 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 0.6 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember |  |
Income tax benefit (in dollars) | 0.8 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 0.2 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember |  |
Shares vested | 65,089 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 18,280 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember |
2012-2014 LTIP linked to other performance conditions |  |  |  |
Share-based compensation |  |  |  |
Unrecognized compensation cost | $ 3.4 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = he_LongTermIncentive2012To2014PlanLinkedToOtherPerformanceConditionsMember |  |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized | 1 year 6 months |  |  |

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- 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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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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