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Electric utility segment - Condensed consolidating statement of comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Condensed Statement of Income Captions [Line Items]        
Net income for common stock $ 46,054 $ 38,661 $ 86,301 $ 72,854
Derivatives qualifying as cash flow hedges:        
Reclassification adjustment to net income, net of tax benefits 0 0 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 5,350 3,930 10,496 7,851
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (4,827) (3,581) (9,449) (7,194)
Other comprehensive income (loss), net of taxes (3,825) 2,370 (16,598) 3,355
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 42,229 41,031 69,703 76,209
Consolidating adjustments        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock (9,080) (7,936) (18,405) (16,539)
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 (1,383) (793) (2,620) (1,762)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 1,382 791 2,619 1,761
Other comprehensive income (loss), net of taxes (1) (2) (1) (1)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. (9,081) (7,938) (18,406) (16,540)
Hawaiian Electric (parent only) | Reportable Legal Entities        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 31,169 25,644 58,644 47,109
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 4,853 3,621 9,506 7,239
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (4,827) (3,581) (9,449) (7,194)
Other comprehensive income (loss), net of taxes 26 40 57 499
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 31,195 25,684 58,701 47,608
HELCO | Reportable Legal Entities        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 3,763 3,632 9,864 8,216
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 734 449 1,409 952
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (733) (448) (1,408) (951)
Other comprehensive income (loss), net of taxes 1 1 1 1
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 3,764 3,633 9,865 8,217
Maui Electric | Reportable Legal Entities        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 5,317 4,304 8,541 8,323
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 649 344 1,211 810
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (649) (343) (1,211) (810)
Other comprehensive income (loss), net of taxes 0 1 0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 5,317 4,305 8,541 8,323
Other subsidiaries | Reportable Legal Entities        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 0 0 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 0 0 0 0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 0 0 0 0
Other comprehensive income (loss), net of taxes 0 0 0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 0 0 0 0
Hawaiian Electric Company, Inc. and Subsidiaries        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 31,169 25,644 58,644 47,109
Derivatives qualifying as cash flow hedges:        
Reclassification adjustment to net income, net of tax benefits 0 0 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 4,853 3,621 9,506 7,239
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (4,827) (3,581) (9,449) (7,194)
Other comprehensive income (loss), net of taxes 26 40 57 499
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 31,195 $ 25,684 $ 58,701 $ 47,608