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Electric utility segment - Condensed consolidating statement of changes in common stock equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Increase (decrease) in stockholders' equity        
Beginning Balance     $ 2,066,753 $ 1,927,640
Net income for common stock $ 38,661 $ 44,128 72,854 76,480
Other comprehensive income (loss), net of taxes 2,370 2,108 3,355 10,908
Common stock dividends     (67,426) (66,848)
Ending Balance 2,075,029 1,966,182 2,075,029 1,966,182
Hawaiian Electric Company        
Increase (decrease) in stockholders' equity        
Beginning Balance     1,799,787 1,728,325
Net income for common stock 25,644 35,857 47,109 61,224
Other comprehensive income (loss), net of taxes 40 (755) 499 261
Common stock dividends     (43,884) (46,800)
Common stock issuance expenses     (5) (4)
Ending Balance 1,803,506 1,743,006 1,803,506 1,743,006
HELCO        
Increase (decrease) in stockholders' equity        
Beginning Balance     291,291 292,702
Net income for common stock 3,632 5,220 8,216 9,182
Other comprehensive income (loss), net of taxes 1 (1) 1 (1)
Common stock dividends     (7,748) (6,604)
Common stock issuance expenses     0 (4)
Ending Balance 291,760 295,275 291,760 295,275
Maui Electric        
Increase (decrease) in stockholders' equity        
Beginning Balance     259,554 263,725
Net income for common stock 4,304 5,663 8,323 9,630
Other comprehensive income (loss), net of taxes 1 (2) 0 (2)
Common stock dividends     (5,973) (6,530)
Common stock issuance expenses     (1) 0
Ending Balance 261,903 266,823 261,903 266,823
Other subsidiaries        
Increase (decrease) in stockholders' equity        
Beginning Balance     101 101
Net income for common stock 0 0 0 0
Other comprehensive income (loss), net of taxes 0 0 0 0
Common stock dividends     0 0
Common stock issuance expenses     0 0
Ending Balance 101 101 101 101
Consolidating adjustments        
Increase (decrease) in stockholders' equity        
Beginning Balance     (550,946) (556,528)
Net income for common stock (7,936) (10,883) (16,539) (18,812)
Other comprehensive income (loss), net of taxes (2) 3 (1) 3
Common stock dividends     13,721 13,134
Common stock issuance expenses     1 4
Ending Balance (553,764) (562,199) (553,764) (562,199)
Hawaiian Electric Company, Inc. and Subsidiaries        
Increase (decrease) in stockholders' equity        
Beginning Balance     1,799,787 1,728,325
Net income for common stock 25,644 35,857 47,109 61,224
Other comprehensive income (loss), net of taxes 40 (755) 499 261
Common stock dividends     (43,884) (46,800)
Common stock issuance expenses     (5) (4)
Ending Balance $ 1,803,506 $ 1,743,006 $ 1,803,506 $ 1,743,006