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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications $ 205 $ 523 $ 410 $ 1,047
Hawaiian Electric Company, Inc. and Subsidiaries        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 23 26 47 57
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 2,503 5,350 5,006 10,496
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost | Hawaiian Electric Company, Inc. and Subsidiaries        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications 2,321 4,853 4,643 9,506
Impact of D&Os of the PUC included in regulatory assets        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications (2,298) (4,827) (4,596) (9,449)
Impact of D&Os of the PUC included in regulatory assets | Hawaiian Electric Company, Inc. and Subsidiaries        
Reclassifications out of accumulated other comprehensive income/(loss)        
Total reclassifications $ (2,298) $ (4,827) $ (4,596) $ (9,449)