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Electric utility segment - Consolidating Statements of Changes in Common Stock Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Increase (decrease) in stockholders' equity                      
Beginning Balance       $ 1,927,640       $ 1,790,573 $ 1,927,640 $ 1,790,573 $ 1,726,406
Net income for common stock $ 44,634 $ 127,142 $ 44,128 32,352 $ 42,320 $ 50,673 $ 35,018 31,866 248,256 159,877 168,129
Other comprehensive income (loss), net of tax benefits                 (6,867) 1,116 (10,628)
Issuance of common stock, net of expenses                 26,844   2,461
Common stock dividends                 (134,050) (131,765) (126,505)
Ending Balance 2,066,753       1,927,640       2,066,753 1,927,640 1,790,573
HECO                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       1,728,325       1,682,144 1,728,325 1,682,144 1,593,564
Net income for common stock                 142,317 135,714 137,641
Other comprehensive income (loss), net of tax benefits                 (1,247) 880 (563)
Issuance of common stock, net of expenses                 23,991 (8) 39,994
Common stock dividends                 (93,599) (90,405) (88,492)
Ending Balance 1,799,787       1,728,325       1,799,787 1,728,325 1,682,144
Hawaii Electric Light Company, Inc. (HELCO)                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       292,702       281,846 292,702 281,846 274,802
Net income for common stock                 21,255 20,755 18,689
Other comprehensive income (loss), net of tax benefits                 (154) 122 (18)
Issuance of common stock, net of expenses                 (5)   0
Common stock dividends                 (22,507) (10,021) (11,627)
Ending Balance 291,291       292,702       291,291 292,702 281,846
MECO                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       263,725       256,692 263,725 256,692 248,771
Net income for common stock                 21,136 22,165 22,275
Other comprehensive income (loss), net of tax benefits                 (46) 44 (5)
Issuance of common stock, net of expenses                 0 (1) 0
Common stock dividends                 (25,261) (15,175) (14,349)
Ending Balance 259,554       263,725       259,554 263,725 256,692
Other subsidiaries                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       101       101 101 101 101
Net income for common stock                 0 0 0
Other comprehensive income (loss), net of tax benefits                     0
Issuance of common stock, net of expenses                     0
Ending Balance 101       101       101 101 101
Consolidating adjustments                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       (556,528)       (538,639) (556,528) (538,639) (523,674)
Net income for common stock                 (42,391) (42,920) (40,964)
Other comprehensive income (loss), net of tax benefits                 200 (166) 23
Issuance of common stock, net of expenses                 5 1 0
Common stock dividends                 47,768 25,196 25,976
Ending Balance (550,946)       (556,528)       (550,946) (556,528) (538,639)
HECO Consolidated                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       1,728,325       1,682,144 1,728,325 1,682,144 1,593,564
Net income for common stock 34,119 $ 46,974 $ 35,857 $ 25,367 32,993 $ 43,006 $ 32,841 $ 26,874 142,317 135,714 137,641
Other comprehensive income (loss), net of tax benefits                 (1,247) 880 (563)
Issuance of common stock, net of expenses                 23,991 (8) 39,994
Common stock dividends                 (93,599) (90,405) (88,492)
Ending Balance $ 1,799,787       $ 1,728,325       $ 1,799,787 $ 1,728,325 $ 1,682,144