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Electric utility segment (Details 8) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net income for common stock $ 39,013 $ 48,236 $ 40,588 $ 33,679 $ 13,836 $ 47,706 $ 38,800 $ 38,316 $ 161,516 $ 138,658 $ 138,230
Prior service credit arising during the period, net of taxes                 0 0 6,943
Net gains (losses) arising during the period, net of (taxes) benefits                 223,177 (99,159) (130,191)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits                 23,280 15,291 9,364
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes                 (222,595) 75,471 100,692
Other comprehensive income (loss), net of taxes                 9,673 (7,286) (6,665)
Comprehensive income attributable to common shareholder                 171,189 131,372 131,565
HECO
                      
Net income for common stock                 122,929 99,276 99,986
Prior service credit arising during the period, net of taxes                     6,921
Net gains (losses) arising during the period, net of (taxes) benefits                 203,479 (90,082) (116,726)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits                 20,694 13,673 8,372
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes                 (222,595) 75,471 100,692
Other comprehensive income (loss), net of taxes                 1,578 (938) (741)
Comprehensive income attributable to common shareholder                 124,507 98,338 99,245
HELCO
                      
Net income for common stock                 20,136 16,212 26,651
Prior service credit arising during the period, net of taxes                     1,419
Net gains (losses) arising during the period, net of (taxes) benefits                 30,542 (13,577) (18,224)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits                 2,880 2,101 1,324
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes                 (33,277) 11,442 15,436
Other comprehensive income (loss), net of taxes                 145 (34) (45)
Comprehensive income attributable to common shareholder                 20,281 16,178 26,606
MECO
                      
Net income for common stock                 21,277 12,627 17,974
Prior service credit arising during the period, net of taxes                     1,239
Net gains (losses) arising during the period, net of (taxes) benefits                 27,919 (10,935) (16,816)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits                 2,557 1,771 1,158
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes                 (30,377) 9,093 14,366
Other comprehensive income (loss), net of taxes                 99 (71) (53)
Comprehensive income attributable to common shareholder                 21,376 12,556 17,921
RHI
                      
Net income for common stock                 (3) (3) (9)
Prior service credit arising during the period, net of taxes                     0
Net gains (losses) arising during the period, net of (taxes) benefits                     0
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits                     0
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes                     0
Other comprehensive income (loss), net of taxes                     0
Comprehensive income attributable to common shareholder                 (3) (3) (9)
Consolidating adjustments
                      
Net income for common stock                 (41,410) (28,836) (44,616)
Prior service credit arising during the period, net of taxes                     (2,658)
Net gains (losses) arising during the period, net of (taxes) benefits                 (58,461) 24,512 35,040
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits                 (5,437) (3,872) (2,482)
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes                 63,654 (20,535) (29,802)
Other comprehensive income (loss), net of taxes                 (244) 105 98
Comprehensive income attributable to common shareholder                 (41,654) (28,731) (44,518)
HECO Consolidated
                      
Net income for common stock 31,990 37,817 28,693 24,429 4,225 38,375 29,376 27,300 122,929 99,276 99,986
Prior service credit arising during the period, net of taxes                 0 0 6,921
Net gains (losses) arising during the period, net of (taxes) benefits                 203,479 (90,082) (116,726)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits                 20,694 13,673 8,372
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes                 (222,595) 75,471 100,692
Other comprehensive income (loss), net of taxes                 1,578 (938) (741)
Comprehensive income attributable to common shareholder                 $ 124,507 $ 98,338 $ 99,245