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Recent accounting pronouncements (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other assets $ 459,187 $ 480,457
Total assets 12,198,985 11,782,018
Liabilities and Equity 12,198,985 11,782,018
Long-term debt, net—other than bank 1,579,065 1,578,368
Total liabilities 10,096,304 9,820,085
Hawaiian Electric Company, Inc. and Subsidiaries    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets 5,800,826 5,672,210
Liabilities and Equity 5,800,826 5,672,210
Unamortized debt expense 267 497
Total other long-term assets 874,355 900,483
Long-term debt, net 1,279,327 1,278,702
Total capitalization 3,080,347 3,041,320
Hawaiian Electric Company    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets 4,598,577 4,476,175
Liabilities and Equity 4,598,577 4,476,175
Unamortized debt expense 193 359
Total other long-term assets 637,788 657,047
Long-term debt, net 875,573 875,163
Total capitalization 2,664,593 2,625,781
HELCO    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets 967,743 954,515
Liabilities and Equity 967,743 954,515
Unamortized debt expense 33 74
Total other long-term assets 124,534 129,329
Long-term debt, net 213,673 213,580
Total capitalization 519,949 513,282
Maui Electric    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets 851,231 830,160
Liabilities and Equity 851,231 830,160
Unamortized debt expense 41 64
Total other long-term assets 112,033 114,107
Long-term debt, net 190,081 189,959
Total capitalization $ 466,062 458,684
As previously filed    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other assets   488,635
Total assets   11,790,196
Liabilities and Equity   11,790,196
Long-term debt, net—other than bank   1,586,546
Total liabilities   9,828,263
As previously filed | Hawaiian Electric Company, Inc. and Subsidiaries    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets   5,680,054
Liabilities and Equity   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
As previously filed | Hawaiian Electric Company    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets   4,481,558
Liabilities and Equity   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
As previously filed | HELCO    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets   955,935
Liabilities and Equity   955,935
Unamortized debt expense   1,494
Total other long-term assets   130,749
Long-term debt, net   215,000
Total capitalization   514,702
As previously filed | Maui Electric    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets   831,201
Liabilities and Equity   831,201
Unamortized debt expense   1,105
Total other long-term assets   115,148
Long-term debt, net   191,000
Total capitalization   459,725
As currently reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liabilities and Equity   (8,178)
As currently reported | Hawaiian Electric Company, Inc. and Subsidiaries    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liabilities and Equity   (7,844)
As currently reported | Hawaiian Electric Company    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liabilities and Equity   (5,383)
As currently reported | HELCO    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liabilities and Equity   (1,420)
As currently reported | Maui Electric    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liabilities and Equity   (1,041)
As currently reported | Accounting Standards Update 2015-03    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other assets   (8,178)
Total assets   (8,178)
Long-term debt, net—other than bank   (8,178)
Total liabilities   (8,178)
As currently reported | Accounting Standards Update 2015-03 | Hawaiian Electric Company, Inc. and Subsidiaries    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total 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)
As currently reported | Accounting Standards Update 2015-03 | Hawaiian Electric Company    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total 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)
As currently reported | Accounting Standards Update 2015-03 | HELCO    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total 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)
As currently reported | Accounting Standards Update 2015-03 | Maui Electric    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total 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)