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Electric utility subsidiary - Consolidating statement of comprehensive income (Details 2) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Condensed Statement of Income Captions [Line Items]    
Net income for common stock $ 31,866 $ 45,787
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 $3,141 and $1,605 for the respective periods 5,459 2,813
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $3,127 and $1,598 for the respective periods (4,911) (2,510)
Other comprehensive income, net of taxes 4,058 1,167
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 35,924 46,954
Hawaiian Electric Company    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 26,874 35,420
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 $3,141 and $1,605 for the respective periods 4,933 2,519
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $3,127 and $1,598 for the respective periods (4,911) (2,510)
Other comprehensive income, net of taxes 22 9
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 26,896 35,429
HELCO    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 3,788 5,161
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 $3,141 and $1,605 for the respective periods 651 344
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $3,127 and $1,598 for the respective periods (651) (344)
Other comprehensive income, net of taxes 0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 3,788 5,161
Maui Electric    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 3,904 3,756
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 $3,141 and $1,605 for the respective periods 600 253
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $3,127 and $1,598 for the respective periods (600) (253)
Other comprehensive income, net of taxes 0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 3,904 3,756
Other subsidiaries    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 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 $3,141 and $1,605 for the respective periods 0 0
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $3,127 and $1,598 for the respective periods 0 0
Other comprehensive income, 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 (7,692) (8,917)
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 $3,141 and $1,605 for the respective periods (1,251) (597)
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $3,127 and $1,598 for the respective periods 1,251 597
Other comprehensive income, net of taxes 0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. (7,692) (8,917)
HECO Consolidated    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 26,874 35,420
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 $3,141 and $1,605 for the respective periods 4,933 2,519
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $3,127 and $1,598 for the respective periods (4,911) (2,510)
Other comprehensive income, net of taxes 22 9
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 26,896 $ 35,429