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Summary of significant accounting policies (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 01, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Other amortization $ 11,619 $ 10,282 $ 7,324  
Increase in deferred income taxes 41,433 104,226 80,145  
Share-based compensation expense 6,542 9,287 7,780  
Increase (decrease) in accounts, interest and dividends payable (52,663) (67,189) 12,406  
Change in prepaid and accrued income taxes and utility revenue taxes (42,596) (39,091) (19,406)  
Change in other assets and liabilities (41,071) (101,196) (14,292)  
Net cash provided by operating activities 355,880 325,420 361,568  
Capital expenditures (363,804) (364,826) (389,438)  
Cash flows from investing activities-Other 7,940 1,125 1,177  
Net cash used in investing activities (705,724) (592,449) (598,182)  
Federal current taxes 44,343 (8,959) (295)  
Federal deferred taxes 36,664 91,412 73,473  
Hawaiian Electric Company, Inc. and Subsidiaries        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Other amortization 8,939 9,897 7,734  
Increase (decrease) in accounts payable (54,555) (65,527) 14,731  
Increase in deferred income taxes 75,626 82,947 64,507  
Change in prepaid and accrued income taxes and utility revenue taxes (63,096) (4,036) (2,028)  
Change in other assets and liabilities (32,620) (66,687) (35,293)  
Net cash provided by operating activities 333,406 306,995 326,865  
Capital expenditures (350,161) (336,679) (378,044)  
Cash flows from investing activities-Other 1,140 1,164 907  
Net cash used in investing activities (308,782) (293,709) (344,977)  
Federal current taxes 0 1,108 1,313  
Federal deferred taxes $ 68,757 68,775 58,024  
As previously filed        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Increase in deferred income taxes   103,916 80,399  
Change in other assets and liabilities   (94,966) (11,696)  
Difference        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Increase in deferred income taxes   310 (254)  
Change in other assets and liabilities   $ (119) $ 61  
Accounting Standards Update 2014-01 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect on retained earnings of adoption of guidance       $ 900