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Electric utility segment - Consolidating statement of comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Condensed Statement of Income Captions [Line Items]        
Net income for common stock $ 127,142 $ 50,673 $ 203,622 $ 117,557
Other comprehensive income (loss), net of taxes:        
Effective portion of foreign currency hedge net unrealized gains, net of taxes of $205, nil, $368 and nil for the respective periods 321 0 578 0
Less: reclassification adjustment to net income, net of (taxes) benefits of $(110), $37, $(75) and $112 for the respective periods (173) 59 (119) 177
Retirement benefit plans:        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,110, $3,245, $6,331 and $9,735 for the respective periods 3,641 5,611 10,877 16,850
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods (3,311) (5,091) (9,934) (15,274)
Other comprehensive income (loss), net of taxes (1,669) 4,430 9,239 5,361
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 125,473 55,103 212,861 122,918
Hawaiian Electric Company        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 46,974 43,006 108,198 102,721
Other comprehensive income (loss), net of taxes:        
Effective portion of foreign currency hedge net unrealized gains, net of taxes of $205, nil, $368 and nil for the respective periods 321   578  
Less: reclassification adjustment to net income, net of (taxes) benefits of $(110), $37, $(75) and $112 for the respective periods (173)   (173)  
Retirement benefit plans:        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,110, $3,245, $6,331 and $9,735 for the respective periods 3,314 5,095 9,941 15,285
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods (3,311) (5,091) (9,934) (15,274)
Other comprehensive income (loss), net of taxes 151 4 412 11
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 47,125 43,010 108,610 102,732
HELCO        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 7,304 4,189 16,486 12,461
Other comprehensive income (loss), net of taxes:        
Effective portion of foreign currency hedge net unrealized gains, net of taxes of $205, nil, $368 and nil for the respective periods 0   0  
Less: reclassification adjustment to net income, net of (taxes) benefits of $(110), $37, $(75) and $112 for the respective periods 0   0  
Retirement benefit plans:        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,110, $3,245, $6,331 and $9,735 for the respective periods 429 682 1,288 2,046
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods (429) (683) (1,289) (2,050)
Other comprehensive income (loss), net of taxes 0 (1) (1) (4)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 7,304 4,188 16,485 12,457
Maui Electric        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 7,425 7,669 17,055 16,713
Other comprehensive income (loss), net of taxes:        
Effective portion of foreign currency hedge net unrealized gains, net of taxes of $205, nil, $368 and nil for the respective periods 0   0  
Less: reclassification adjustment to net income, net of (taxes) benefits of $(110), $37, $(75) and $112 for the respective periods 0   0  
Retirement benefit plans:        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,110, $3,245, $6,331 and $9,735 for the respective periods 387 626 1,162 1,878
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods (389) (627) (1,166) (1,882)
Other comprehensive income (loss), net of taxes (2) (1) (4) (4)
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 7,423 7,668 17,051 16,709
Other subsidiaries        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 0 0 0 0
Other comprehensive income (loss), net of taxes:        
Effective portion of foreign currency hedge net unrealized gains, net of taxes of $205, nil, $368 and nil for the respective periods 0   0  
Less: reclassification adjustment to net income, net of (taxes) benefits of $(110), $37, $(75) and $112 for the respective periods 0   0  
Retirement benefit plans:        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,110, $3,245, $6,331 and $9,735 for the respective periods 0 0 0 0
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods 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 (14,729) (11,858) (33,541) (29,174)
Other comprehensive income (loss), net of taxes:        
Effective portion of foreign currency hedge net unrealized gains, net of taxes of $205, nil, $368 and nil for the respective periods 0   0  
Less: reclassification adjustment to net income, net of (taxes) benefits of $(110), $37, $(75) and $112 for the respective periods 0   0  
Retirement benefit plans:        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,110, $3,245, $6,331 and $9,735 for the respective periods (816) (1,308) (2,450) (3,924)
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods 818 1,310 2,455 3,932
Other comprehensive income (loss), net of taxes 2 2 5 8
Comprehensive income attributable to Hawaiian Electric Industries, Inc. (14,727) (11,856) (33,536) (29,166)
Hawaiian Electric Company, Inc. and Subsidiaries        
Condensed Statement of Income Captions [Line Items]        
Net income for common stock 46,974 43,006 108,198 102,721
Other comprehensive income (loss), net of taxes:        
Effective portion of foreign currency hedge net unrealized gains, net of taxes of $205, nil, $368 and nil for the respective periods 321 0 578 0
Less: reclassification adjustment to net income, net of (taxes) benefits of $(110), $37, $(75) and $112 for the respective periods (173) 0 (173) 0
Retirement benefit plans:        
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $2,110, $3,245, $6,331 and $9,735 for the respective periods 3,314 5,095 9,941 15,285
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,109, $3,243, $6,327 and $9,729 for the respective periods (3,311) (5,091) (9,934) (15,274)
Other comprehensive income (loss), net of taxes 151 4 412 11
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 47,125 $ 43,010 $ 108,610 $ 102,732