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Electric utility segment - Condensed consolidating statement of comprehensive income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | $ 40,247 | $ 34,193
Derivatives qualifying as cash flow hedges: |  |
Reclassification adjustment to net income, net of tax benefits | 0 | 454
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 of $___, $2,160, $___ and $4,221, respectively | 5,146 | 3,921
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (4,622) | (3,613)
Other comprehensive income (loss), net of taxes | (12,773) | 985
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 27,474 | 35,178
Hawaiian Electric Company |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 27,475 | 21,465
Derivatives qualifying as cash flow hedges: |  |
Reclassification adjustment to net income, net of tax benefits |  | 454
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 of $___, $2,160, $___ and $4,221, respectively | 4,653 | 3,618
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (4,622) | (3,613)
Other comprehensive income (loss), net of taxes | 31 | 459
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 27,506 | 21,924
HELCO |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 6,101 | 4,584
Derivatives qualifying as cash flow hedges: |  |
Reclassification adjustment to net income, net of tax benefits |  | 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 of $___, $2,160, $___ and $4,221, respectively | 675 | 503
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (675) | (503)
Other comprehensive income (loss), net of taxes | 0 | 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 6,101 | 4,584
Maui Electric |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 3,224 | 4,019
Derivatives qualifying as cash flow hedges: |  |
Reclassification adjustment to net income, net of tax benefits |  | 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 of $___, $2,160, $___ and $4,221, respectively | 562 | 466
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (562) | (467)
Other comprehensive income (loss), net of taxes | 0 | (1)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | 3,224 | 4,018
Other subsidiaries |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 0 | 0
Derivatives qualifying as cash flow hedges: |  |
Reclassification adjustment to net income, net of tax benefits |  | 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 of $___, $2,160, $___ and $4,221, respectively | 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
Consolidating adjustments |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | (9,325) | (8,603)
Derivatives qualifying as cash flow hedges: |  |
Reclassification adjustment to net income, net of tax benefits |  | 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 of $___, $2,160, $___ and $4,221, respectively | (1,237) | (969)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 1,237 | 970
Other comprehensive income (loss), net of taxes | 0 | 1
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | (9,325) | (8,602)
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income for common stock | 27,475 | 21,465
Derivatives qualifying as cash flow hedges: |  |
Reclassification adjustment to net income, net of tax benefits | 0 | 454
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 of $___, $2,160, $___ and $4,221, respectively | 4,653 | 3,618
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (4,622) | (3,613)
Other comprehensive income (loss), net of taxes | 31 | 459
Comprehensive income attributable to Hawaiian Electric Industries, Inc. | $ 27,506 | $ 21,924

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