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Electric utility segment - Consolidating statement of changes in common stock equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Increase (decrease) in stockholders' equity
Beginning Balance			$ 1,927,640	$ 1,790,573
Net income for common stock	$ 127,142	$ 50,673	203,622	117,557
Current period other comprehensive income	(1,669)	4,430	9,239	5,361
Common stock dividends			(100,398)	(98,452)
Ending Balance	2,068,388	1,921,001	2,068,388	1,921,001
Hawaiian Electric Company
Increase (decrease) in stockholders' equity
Beginning Balance			1,728,325	1,682,144
Net income for common stock	46,974	43,006	108,198	102,721
Current period other comprehensive income	151	4	412	11
Common stock dividends			(70,199)	(67,804)
Common stock issuance expenses			(9)	(8)
Ending Balance	1,766,727	1,717,064	1,766,727	1,717,064
HELCO
Increase (decrease) in stockholders' equity
Beginning Balance			292,702	281,846
Net income for common stock	7,304	4,189	16,486	12,461
Current period other comprehensive income	0	(1)	(1)	(4)
Common stock dividends			(9,906)	(7,515)
Common stock issuance expenses			(5)	0
Ending Balance	299,276	286,788	299,276	286,788
Maui Electric
Increase (decrease) in stockholders' equity
Beginning Balance			263,725	256,692
Net income for common stock	7,425	7,669	17,055	16,713
Current period other comprehensive income	(2)	(1)	(4)	(4)
Common stock dividends			(9,795)	(11,382)
Common stock issuance expenses			0	(1)
Ending Balance	270,981	262,018	270,981	262,018
Other subsidiaries
Increase (decrease) in stockholders' equity
Beginning Balance			101	101
Net income for common stock	0	0	0	0
Current period other comprehensive income	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			(556,528)	(538,639)
Net income for common stock	(14,729)	(11,858)	(33,541)	(29,174)
Current period other comprehensive income	2	2	5	8
Common stock dividends			19,701	18,897
Common stock issuance expenses			5	1
Ending Balance	(570,358)	(548,907)	(570,358)	(548,907)
Hawaiian Electric Company, Inc. and Subsidiaries
Increase (decrease) in stockholders' equity
Beginning Balance			1,728,325	1,682,144
Net income for common stock	46,974	43,006	108,198	102,721
Current period other comprehensive income	151	4	412	11
Common stock dividends			(70,199)	(67,804)
Common stock issuance expenses			(9)	(8)
Ending Balance	$ 1,766,727	$ 1,717,064	$ 1,766,727	$ 1,717,064

X

- Definition

Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

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