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Summary of significant accounting policies (Details 6) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets $ 11,790,196 $ 11,185,142 $ 10,340,906
Total capitalization and liabilities 11,790,196 11,185,142  
Deferred income taxes   633,570  
Electric utility      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets 5,680,054 5,557,542 5,066,427
As previously filed      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   11,184,161  
Total capitalization and liabilities   11,184,161  
Deferred income taxes   631,734  
As previously filed | Electric utility      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets     5,087,129
Restatement adjustment | Accounting Standards Update 2015-17 | Electric utility      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets     $ (20,702)
Hawaiian Electric Company, Inc. and Subsidiaries      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other 36,640 33,468  
Total current assets 486,660 582,088  
Assets 5,680,054 5,557,542  
Total capitalization and liabilities 5,680,054 5,557,542  
Other 54,079 61,664  
Total current liabilities 385,324 498,948  
Deferred income taxes 654,806 573,439  
Total deferred credits and other liabilities 1,739,479 1,669,179  
Hawaiian Electric Company, Inc. and Subsidiaries | As previously filed      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other   66,383  
Total current assets   615,003  
Assets   5,590,457  
Total capitalization and liabilities   5,590,457  
Other   65,146  
Total current liabilities   502,430  
Deferred income taxes   602,872  
Total deferred credits and other liabilities   1,698,612  
Hawaiian Electric Company, Inc. and Subsidiaries | Restatement adjustment | Accounting Standards Update 2015-17      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other   (32,915)  
Total current assets   (32,915)  
Assets   (32,915)  
Total capitalization and liabilities   (32,915)  
Other   (3,482)  
Total current liabilities   (3,482)  
Deferred income taxes   (29,433)  
Total deferred credits and other liabilities   (29,433)  
Hawaiian Electric Company, Inc (HECO)      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other 25,505 20,231  
Total current assets 355,793 439,480  
Assets 4,481,558 4,372,366  
Total capitalization and liabilities 4,481,558 4,372,366  
Other 41,083 45,369  
Total current liabilities 296,129 359,739  
Deferred income taxes 466,133 407,979  
Total deferred credits and other liabilities $ 1,234,538 1,193,905  
Hawaiian Electric Company, Inc (HECO) | As previously filed      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other   44,680  
Total current assets   463,929  
Assets   4,396,815  
Total capitalization and liabilities   4,396,815  
Other   48,282  
Total current liabilities   362,652  
Deferred income taxes   429,515  
Total deferred credits and other liabilities   1,215,441  
Hawaiian Electric Company, Inc (HECO) | Restatement adjustment | Accounting Standards Update 2015-17      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other   (24,449)  
Total current assets   (24,449)  
Assets   (24,449)  
Total capitalization and liabilities   (24,449)  
Other   (2,913)  
Total current liabilities   (2,913)  
Deferred income taxes   (21,536)  
Total deferred credits and other liabilities   (21,536)  
HELCO      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other   10,137  
Total current assets   79,087  
Assets   926,411  
Total capitalization and liabilities   926,411  
Other   9,587  
Total current liabilities   85,352  
Deferred income taxes   91,924  
Total deferred credits and other liabilities   267,798  
HELCO | As previously filed      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other   8,611  
Total current assets   77,561  
Assets   924,885  
Total capitalization and liabilities   924,885  
Other   9,866  
Total current liabilities   85,631  
Deferred income taxes   90,119  
Total deferred credits and other liabilities   265,993  
HELCO | Restatement adjustment | Accounting Standards Update 2015-17      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other   1,526  
Total current assets   1,526  
Assets   1,526  
Total capitalization and liabilities   1,526  
Other   (279)  
Total current liabilities   (279)  
Deferred income taxes   1,805  
Total deferred credits and other liabilities   1,805  
MECO      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other   3,575  
Total current assets   88,919  
Assets   822,985  
Total capitalization and liabilities   822,985  
Other   15,804  
Total current liabilities   79,356  
Deferred income taxes   73,536  
Total deferred credits and other liabilities   207,719  
MECO | As previously filed      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other   13,567  
Total current assets   98,911  
Assets   832,977  
Total capitalization and liabilities   832,977  
Other   16,094  
Total current liabilities   79,646  
Deferred income taxes   83,238  
Total deferred credits and other liabilities   217,421  
MECO | Restatement adjustment | Accounting Standards Update 2015-17      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepayments and other   (9,992)  
Total current assets   (9,992)  
Assets   (9,992)  
Total capitalization and liabilities   (9,992)  
Other   (290)  
Total current liabilities   (290)  
Deferred income taxes   (9,702)  
Total deferred credits and other liabilities   $ (9,702)