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Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other $ 415,955 $ 480,457
Total assets 11,870,506 11,782,018
Liabilities and Equity 11,870,506 11,782,018
Long-term debt, net—other than bank 1,578,618 1,578,368
Liabilities 9,894,034 9,820,085
Hawaiian Electric Company, Inc. and Subsidiaries    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets 5,662,371 5,672,210
Liabilities and Equity 5,662,371 5,672,210
Unamortized debt expense 420 497
Total other long-term assets 874,131 900,483
Long-term debt, net 1,278,916 1,278,702
Total capitalization 3,044,513 3,041,320
Hawaiian Electric Company    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets 4,476,632 4,476,175
Liabilities and Equity 4,476,632 4,476,175
Unamortized debt expense 304 359
Total other long-term assets 634,693 657,047
Long-term debt, net 875,308 875,163
Total capitalization 2,628,905 2,625,781
HELCO    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets 949,694 954,515
Liabilities and Equity 949,694 954,515
Unamortized debt expense 60 74
Total other long-term assets 126,241 129,329
Long-term debt, net 213,608 213,580
Total capitalization 513,966 513,282
Maui Electric    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Total assets 823,562 830,160
Liabilities and Equity 823,562 830,160
Unamortized debt expense 56 64
Total other long-term assets 113,197 114,107
Long-term debt, net 190,000 189,959
Total capitalization $ 459,426 458,684
Scenario, Previously Reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other   488,635
Total assets   11,790,196
Liabilities and Equity   11,790,196
Long-term debt, net—other than bank   1,586,546
Liabilities   9,828,263
Scenario, Previously Reported | 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
Scenario, Previously Reported | 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
Scenario, Previously Reported | 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
Scenario, Previously Reported | 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
Restatement Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liabilities and Equity   (8,178)
Restatement Adjustment | Hawaiian Electric Company, Inc. and Subsidiaries    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liabilities and Equity   (7,844)
Restatement Adjustment | Hawaiian Electric Company    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liabilities and Equity   (5,383)
Restatement Adjustment | HELCO    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liabilities and Equity   (1,420)
Restatement Adjustment | Maui Electric    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liabilities and Equity   (1,041)
Restatement Adjustment | Accounting Standards Update 2015-03    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other   (8,178)
Total assets   (8,178)
Long-term debt, net—other than bank   (8,178)
Liabilities   (8,178)
Restatement Adjustment | 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)
Restatement Adjustment | 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)
Restatement Adjustment | 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)
Restatement Adjustment | 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)