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Electric utility segment - Condensed consolidating statement of changes in common stock equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Increase (decrease) in stockholders' equity    
Beginning Balance $ 2,066,753 $ 1,927,640
Net income for common stock 34,193 32,352
Other comprehensive income (loss), net of taxes 985 8,800
Common stock dividends (33,713) (33,367)
Ending Balance 2,065,588 1,942,179
Hawaiian Electric Company    
Increase (decrease) in stockholders' equity    
Beginning Balance 1,799,787 1,728,325
Net income for common stock 21,465 25,367
Other comprehensive income (loss), net of taxes 459 1,016
Common stock dividends (21,942) (23,400)
Common stock issuance expenses   (4)
Ending Balance 1,799,769 1,731,304
HELCO    
Increase (decrease) in stockholders' equity    
Beginning Balance 291,291 292,702
Net income for common stock 4,584 3,962
Other comprehensive income (loss), net of taxes 0 0
Common stock dividends (3,874) (3,302)
Common stock issuance expenses   (4)
Ending Balance 292,001 293,358
Maui Electric    
Increase (decrease) in stockholders' equity    
Beginning Balance 259,554 263,725
Net income for common stock 4,019 3,967
Other comprehensive income (loss), net of taxes (1) 0
Common stock dividends (2,986) (3,265)
Common stock issuance expenses   (1)
Ending Balance 260,586 264,426
Other subsidiaries    
Increase (decrease) in stockholders' equity    
Beginning Balance 101 101
Net income for common stock 0 0
Other comprehensive income (loss), net of taxes 0 0
Common stock dividends 0 0
Common stock issuance expenses   0
Ending Balance 101 101
Consolidating adjustments    
Increase (decrease) in stockholders' equity    
Beginning Balance (550,946) (556,528)
Net income for common stock (8,603) (7,929)
Other comprehensive income (loss), net of taxes 1 0
Common stock dividends 6,860 6,567
Common stock issuance expenses   5
Ending Balance (552,688) (557,885)
Hawaiian Electric Company, Inc. and Subsidiaries    
Increase (decrease) in stockholders' equity    
Beginning Balance 1,799,787 1,728,325
Net income for common stock 21,465 25,367
Other comprehensive income (loss), net of taxes 459 1,016
Common stock dividends (21,942) (23,400)
Common stock issuance expenses   (4)
Ending Balance $ 1,799,769 $ 1,731,304