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Electric utility segment - Condensed consolidating statement of comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Condensed Statement of Income Captions [Line Items]        
Net income for common stock $ 60,073 $ 127,142 $ 132,927 $ 203,622
Derivatives qualifying as cash flow hedges:        
Effective portion of foreign currency hedge net unrealized gain, net of taxes 0 321 0 578
Reclassification adjustment to net income, net of tax benefits 0 (173) 454 (119)
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 3,942 3,641 11,793 10,877
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (3,596) (3,311) (10,790) (9,934)
Other comprehensive income (loss), net of taxes 554 (1,669) 3,909 9,239
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 60,627 125,473 136,836 212,861
Hawaiian Electric Company        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 47,487 46,974 94,596 108,198
Derivatives qualifying as cash flow hedges:        
Effective portion of foreign currency hedge net unrealized gain, net of taxes   321   578
Reclassification adjustment to net income, net of tax benefits   (173) 454 (173)
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 3,618 3,314 10,857 9,941
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (3,596) (3,311) (10,790) (9,934)
Other comprehensive income (loss), net of taxes 22 151 521 412
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 47,509 47,125 95,117 108,610
HELCO        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 6,434 7,304 14,650 16,486
Derivatives qualifying as cash flow hedges:        
Effective portion of foreign currency hedge net unrealized gain, net of taxes   0   0
Reclassification adjustment to net income, net of tax benefits   0 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 of $___, $2,160, $___ and $4,221, respectively 476 429 1,428 1,288
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (476) (429) (1,427) (1,289)
Other comprehensive income (loss), net of taxes 0 0 1 (1)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 6,434 7,304 14,651 16,485
Maui Electric        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 6,333 7,425 14,656 17,055
Derivatives qualifying as cash flow hedges:        
Effective portion of foreign currency hedge net unrealized gain, net of taxes   0   0
Reclassification adjustment to net income, net of tax benefits   0 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 of $___, $2,160, $___ and $4,221, respectively 404 387 1,214 1,162
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (404) (389) (1,214) (1,166)
Other comprehensive income (loss), net of taxes 0 (2) 0 (4)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 6,333 7,423 14,656 17,051
Other subsidiaries        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 0 0 0 0
Derivatives qualifying as cash flow hedges:        
Effective portion of foreign currency hedge net unrealized gain, net of taxes   0   0
Reclassification adjustment to net income, net of tax benefits   0 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 of $___, $2,160, $___ and $4,221, respectively 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
Consolidating adjustments        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock (12,767) (14,729) (29,306) (33,541)
Derivatives qualifying as cash flow hedges:        
Effective portion of foreign currency hedge net unrealized gain, net of taxes   0   0
Reclassification adjustment to net income, net of tax benefits   0 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 of $___, $2,160, $___ and $4,221, respectively (880) (816) (2,642) (2,450)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes 880 818 2,641 2,455
Other comprehensive income (loss), net of taxes 0 2 (1) 5
Comprehensive income attributable to Hawaiian Electric Industries, Inc. (12,767) (14,727) (29,307) (33,536)
Hawaiian Electric Company, Inc. and Subsidiaries        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 47,487 46,974 94,596 108,198
Derivatives qualifying as cash flow hedges:        
Effective portion of foreign currency hedge net unrealized gain, net of taxes 0 321 0 578
Reclassification adjustment to net income, net of tax benefits 0 (173) 454 (173)
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 3,618 3,314 10,857 9,941
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes (3,596) (3,311) (10,790) (9,934)
Other comprehensive income (loss), net of taxes 22 151 521 412
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 47,509 $ 47,125 $ 95,117 $ 108,610