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Electric utility subsidiary - Consolidating statement of changes in common stock equity (Details 4) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Balance | $ 1,790,573 us-gaap_StockholdersEquity | $ 1,726,406 us-gaap_StockholdersEquity
Net income for common stock | 31,866 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 45,787 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Other comprehensive income, net of taxes | 4,058 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 1,167 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Common stock dividends | (31,840)us-gaap_DividendsCommonStockCash | (31,448)us-gaap_DividendsCommonStockCash
Balance | 1,897,909 us-gaap_StockholdersEquity | 1,745,124 us-gaap_StockholdersEquity
Hawaiian Electric Company |  |
Balance | 1,682,144 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,593,564 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income for common stock | 26,874 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 35,420 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other comprehensive income, net of taxes | 22 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 9 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Common stock dividends | (22,601)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (22,707)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Common stock issuance expenses | (5)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (3)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Balance | 1,686,434 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,606,283 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
HELCO |  |
Balance | 281,846 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 274,802 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Net income for common stock | 3,788 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 5,161 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Other comprehensive income, net of taxes | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Common stock dividends | (2,505)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | (2,941)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Common stock issuance expenses | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Balance | 283,129 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember | 277,022 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember
Maui Electric |  |
Balance | 256,692 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 248,771 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Net income for common stock | 3,904 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 3,756 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Other comprehensive income, net of taxes | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Common stock dividends | (3,794)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | (3,629)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Common stock issuance expenses | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | (1)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Balance | 256,802 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember | 248,897 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember
Other subsidiaries |  |
Balance | 101 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 101 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Net income for common stock | 0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Other comprehensive income, net of taxes | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Balance | 101 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember | 101 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Consolidating adjustments |  |
Balance | (538,639)us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (523,674)us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Net income for common stock | (7,692)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (8,917)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Other comprehensive income, net of taxes | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Common stock dividends | 6,299 us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | 6,570 us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Common stock issuance expenses | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | 1 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
Balance | (540,032)us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (526,020)us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember
HECO Consolidated |  |
Balance | 1,682,144 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 1,593,564 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Net income for common stock | 26,874 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 35,420 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Other comprehensive income, net of taxes | 22 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 9 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Common stock dividends | (22,601)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | (22,707)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Common stock issuance expenses | (5)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | (3)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Balance | $ 1,686,434 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 1,606,283 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember

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