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Summary of significant accounting policies (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Other $ 447,621 $ 480,457  
Assets 12,425,506 11,782,018 $ 11,177,143
Total capitalization and liabilities 12,425,506 11,782,018  
Long-term debt, net—other than bank 1,619,019 1,578,368  
Total liabilities 10,324,460 9,820,085  
As previously filed      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Other   488,635  
Total capitalization and liabilities   11,790,196  
Long-term debt, net—other than bank   1,586,546  
Total liabilities   9,828,263  
Adjustment from adoption of ASU No. 2015-03      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Total capitalization and liabilities   (8,178)  
Accounting Standards Update 2015-03 | Adjustment from adoption of ASU No. 2015-03      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Other   (8,178)  
Long-term debt, net—other than bank   (8,178)  
Total liabilities   (8,178)  
Hawaiian Electric Company, Inc. and Subsidiaries      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets 5,975,428 5,672,210  
Total capitalization and liabilities 5,975,428 5,672,210  
Unamortized debt expense 208 497  
Total other long-term assets 962,535 900,483  
Long-term debt, net 1,319,260 1,278,702  
Total capitalization 3,153,340 3,041,320  
Hawaiian Electric Company, Inc. and Subsidiaries | As previously filed      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   5,680,054  
Unamortized debt expense   8,341  
Total other long-term assets   908,327  
Long-term debt, net   1,286,546  
Total capitalization   3,049,164  
Hawaiian Electric Company, Inc. and Subsidiaries | Accounting Standards Update 2015-03 | Adjustment from adoption of ASU No. 2015-03      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   (7,844)  
Unamortized debt expense   (7,844)  
Total other long-term assets   (7,844)  
Long-term debt, net   (7,844)  
Total capitalization   (7,844)  
Hawaiian Electric Company, Inc (HECO)      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets 4,720,158 4,476,175  
Total capitalization and liabilities 4,720,158 4,476,175  
Unamortized debt expense 151 359  
Total other long-term assets 706,126 657,047  
Long-term debt, net 915,437 875,163  
Total capitalization $ 2,737,517 2,625,781  
Hawaiian Electric Company, Inc (HECO) | As previously filed      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   4,481,558  
Unamortized debt expense   5,742  
Total other long-term assets   662,430  
Long-term debt, net   880,546  
Total capitalization   2,631,164  
Hawaiian Electric Company, Inc (HECO) | Accounting Standards Update 2015-03 | Adjustment from adoption of ASU No. 2015-03      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   (5,383)  
Unamortized debt expense   (5,383)  
Total other long-term assets   (5,383)  
Long-term debt, net   (5,383)  
Total capitalization   (5,383)  
HELCO      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   954,515  
Unamortized debt expense   74  
Total other long-term assets   129,329  
Long-term debt, net   213,580  
Total capitalization   513,282  
HELCO | As previously filed      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   955,935  
Unamortized debt expense   1,494  
Total other long-term assets   130,749  
Long-term debt, net   215,000  
Total capitalization   514,702  
HELCO | Accounting Standards Update 2015-03 | Adjustment from adoption of ASU No. 2015-03      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   (1,420)  
Unamortized debt expense   (1,420)  
Total other long-term assets   (1,420)  
Long-term debt, net   (1,420)  
Total capitalization   (1,420)  
MECO      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   830,160  
Unamortized debt expense   64  
Total other long-term assets   114,107  
Long-term debt, net   189,959  
Total capitalization   458,684  
MECO | As previously filed      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   831,201  
Unamortized debt expense   1,105  
Total other long-term assets   115,148  
Long-term debt, net   191,000  
Total capitalization   459,725  
MECO | Accounting Standards Update 2015-03 | Adjustment from adoption of ASU No. 2015-03      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Assets   (1,041)  
Unamortized debt expense   (1,041)  
Total other long-term assets   (1,041)  
Long-term debt, net   (1,041)  
Total capitalization   $ (1,041)