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Electric utility segment - Consolidating statement of comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Condensed Statement of Income Captions [Line Items]    
Net income for common stock $ 32,352 $ 31,866
Other comprehensive income, net of taxes:    
Effective portion of foreign currency hedge net unrealized gain, net of taxes of $638 and nil for the respective periods 1,002 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 $2,061 and $3,141 for the respective periods 3,538 5,459
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,052 and $3,127 for the respective periods (3,222) (4,911)
Other comprehensive income, net of taxes 8,800 4,058
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 41,152 35,924
Hawaiian Electric Company    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 25,367 26,874
Other comprehensive income, net of taxes:    
Effective portion of foreign currency hedge net unrealized gain, net of taxes of $638 and nil for the respective periods 1,002  
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 $2,061 and $3,141 for the respective periods 3,236 4,933
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,052 and $3,127 for the respective periods (3,222) (4,911)
Other comprehensive income, net of taxes 1,016 22
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 26,383 26,896
HELCO    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 3,962 3,788
Other comprehensive income, net of taxes:    
Effective portion of foreign currency hedge net unrealized gain, net of taxes of $638 and nil for the respective periods 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 $2,061 and $3,141 for the respective periods 458 651
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,052 and $3,127 for the respective periods (458) (651)
Other comprehensive income, net of taxes 0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 3,962 3,788
Maui Electric    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 3,967 3,904
Other comprehensive income, net of taxes:    
Effective portion of foreign currency hedge net unrealized gain, net of taxes of $638 and nil for the respective periods 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 $2,061 and $3,141 for the respective periods 418 600
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,052 and $3,127 for the respective periods (418) (600)
Other comprehensive income, net of taxes 0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. 3,967 3,904
Other subsidiaries    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 0 0
Other comprehensive income, net of taxes:    
Effective portion of foreign currency hedge net unrealized gain, net of taxes of $638 and nil for the respective periods 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 $2,061 and $3,141 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 $2,052 and $3,127 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 (7,929) (7,692)
Other comprehensive income, net of taxes:    
Effective portion of foreign currency hedge net unrealized gain, net of taxes of $638 and nil for the respective periods 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 $2,061 and $3,141 for the respective periods (876) (1,251)
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,052 and $3,127 for the respective periods 876 1,251
Other comprehensive income, net of taxes 0 0
Comprehensive income attributable to Hawaiian Electric Industries, Inc. (7,929) (7,692)
Hawaiian Electric Company, Inc. and Subsidiaries    
Condensed Statement of Income Captions [Line Items]    
Net income for common stock 25,367 26,874
Other comprehensive income, net of taxes:    
Effective portion of foreign currency hedge net unrealized gain, net of taxes of $638 and nil for the respective periods 1,002 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 $2,061 and $3,141 for the respective periods 3,236 4,933
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,052 and $3,127 for the respective periods (3,222) (4,911)
Other comprehensive income, net of taxes 1,016 22
Comprehensive income attributable to Hawaiian Electric Industries, Inc. $ 26,383 $ 26,896