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Electric utility segment - Condensed consolidating statement of comprehensive income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | $ 45,688 | $ 40,247
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 2,503 | 5,146
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (2,298) | (4,622)
Other comprehensive income (loss), net of taxes | 9,241 | (12,773)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 54,929 | 27,474
Consolidating adjustments |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | (11,849) | (9,325)
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | (641) | (1,237)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 640 | 1,237
Other comprehensive income (loss), net of taxes | (1) | 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | (11,850) | (9,325)
Hawaiian Electric (parent only) | Reportable Legal Entities |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 32,126 | 27,475
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 2,322 | 4,653
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (2,298) | (4,622)
Other comprehensive income (loss), net of taxes | 24 | 31
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 32,150 | 27,506
HELCO | Reportable Legal Entities |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 5,169 | 6,101
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 352 | 675
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (351) | (675)
Other comprehensive income (loss), net of taxes | 1 | 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 5,170 | 6,101
Maui Electric | Reportable Legal Entities |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 6,680 | 3,224
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 289 | 562
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (289) | (562)
Other comprehensive income (loss), net of taxes | 0 | 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 6,680 | 3,224
Other subsidiaries | Reportable Legal Entities |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 0 | 0
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 0 | 0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 0 | 0
Other comprehensive income (loss), net of taxes | 0 | 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 0 | 0
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 32,126 | 27,475
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | 2,322 | 4,653
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (2,298) | (4,622)
Other comprehensive income (loss), net of taxes | 24 | 31
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | $ 32,150 | $ 27,506

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