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Recent accounting pronouncements (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other assets | $ 436,479 | $ 480,457
Total assets | 11,979,239 | 11,782,018
Liabilities and Equity | 11,979,239 | 11,782,018
Long-term debt, net—other than bank | 1,578,842 | 1,578,368
Total liabilities | 9,978,764 | 9,820,085
Hawaiian Electric Company, Inc. and Subsidiaries |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Total assets | 5,721,853 | 5,672,210
Liabilities and Equity | 5,721,853 | 5,672,210
Unamortized debt expense | 344 | 497
Total other long-term assets | 867,412 | 900,483
Long-term debt, net | 1,279,123 | 1,278,702
Total capitalization | 3,056,422 | 3,041,320
Hawaiian Electric Company |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Total assets | 4,532,647 | 4,476,175
Liabilities and Equity | 4,532,647 | 4,476,175
Unamortized debt expense | 249 | 359
Total other long-term assets | 630,272 | 657,047
Long-term debt, net | 875,443 | 875,163
Total capitalization | 2,640,742 | 2,625,781
HELCO |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Total assets | 956,842 | 954,515
Liabilities and Equity | 956,842 | 954,515
Unamortized debt expense | 46 | 74
Total other long-term assets | 125,200 | 129,329
Long-term debt, net | 213,640 | 213,580
Total capitalization | 515,915 | 513,282
Maui Electric |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Total assets | 841,420 | 830,160
Liabilities and Equity | 841,420 | 830,160
Unamortized debt expense | 49 | 64
Total other long-term assets | 111,940 | 114,107
Long-term debt, net | 190,040 | 189,959
Total capitalization | $ 461,863 | 458,684
Scenario, Previously Reported |  |
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
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 assets |  | (8,178)
Total assets |  | (8,178)
Long-term debt, net—other than bank |  | (8,178)
Total 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)

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