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Earnings per share and shareholders' equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 20, 2015 | Jul. 14, 2014 | Dec. 19, 2013 | Mar. 20, 2013 | Mar. 19, 2013
Earnings per share, basic and diluted |  |  |  |  |  |  |
Distributed earnings, Basic (dollars per share) |  | $ 0.31 us-gaap_EarningsPerShareBasicDistributed |  |  |  |  |
Undistributed earnings, Basic (dollars per share) |  | $ 0.14 us-gaap_EarningsPerShareBasicUndistributed |  |  |  |  |
Earnings per share, Basic (in dollars per share) | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic |  |  |  |  |
Equity forward transaction |  |  |  |  |  |  |
Public offering related to equity forward transaction (in shares) |  |  |  |  |  |  | 6,100,000 he_EquityForwardTransactionSharesInConnectionWithPublicOffering
Sale of common stock related to equity forward transaction (in dollars per share) | $ 26.75 he_EquityForwardTransactionSaleOfStockPricePerShare |  |  |  |  |  | $ 26.75 he_EquityForwardTransactionSaleOfStockPricePerShare
Closing price of common stock (in dollar per share) |  |  |  |  |  |  | $ 27.01 us-gaap_SharePrice
Offering related to underwriters exercising their over-allotment option under equity forward transaction (in shares) |  |  |  |  |  | 900,000 he_EquityForwardTransactionSharesInConnectionWithUnderwritersExercisingOverAllotmentOption |
Shares borrowed by forward counterparty from third party | 7,000,000 he_EquityForwardTransactionSharesBorrowed |  |  |  |  |  |
Underwriting discount (in dollars per share) | $ 1.00312 he_EquityForwardTransactionUnderwritingDiscountPerShare |  |  |  |  |  |
Forward sale price (in dollars per share) |  |  |  |  |  |  | $ 25.74688 he_EquityForwardTransactionForwardSalePrice
Initial fair value (in dollars per share) | $ 0 he_EquityForwardTransactionInitialFairValue |  |  |  |  |  |
Delivery of net shares on settlement |  |  | 4,700,000 he_EquityForwardTransactionDeliveryOfNetSharesOnSettlement | 1,000,000 he_EquityForwardTransactionDeliveryOfNetSharesOnSettlement | 1,300,000 he_EquityForwardTransactionDeliveryOfNetSharesOnSettlement |  |
Delivery of cash on settlement |  |  | $ 104.5 he_EquityForwardTransactionDeliveryOfCashOnSettlement | $ 23.9 he_EquityForwardTransactionDeliveryOfCashOnSettlement | $ 32.1 he_EquityForwardTransactionDeliveryOfCashOnSettlement |  |
Underwriting discount |  |  | $ 4.7 he_EquityForwardTransactionUnderwritingDiscount | $ 1.0 he_EquityForwardTransactionUnderwritingDiscount | $ 1.3 he_EquityForwardTransactionUnderwritingDiscount |  |
Stock appreciation rights (SARs) | Common stock |  |  |  |  |  |  |
Antidilutive effect of HEI common stock |  |  |  |  |  |  |
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares) | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 102,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |

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