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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Schedule of earnings per share basic and diluted under two-class method | Under the two-class method, HEI's EPS was comprised as follows for both participating securities and unrestricted common stock:
| 2014 |  | 2013 |  | 2012
| Basic |  |  | Diluted |  |  | Basic |  |  | Diluted |  |  | Basic |  |  | Diluted |
Distributed earnings | $ | 1.24 |  |  | $ | 1.24 |  |  | $ | 1.24 |  |  | $ | 1.24 |  |  | $ | 1.24 |  |  | $ | 1.24 |
Undistributed earnings | 0.41 |  |  | 0.40 |  |  | 0.39 |  |  | 0.38 |  |  | 0.19 |  |  | 0.18 |
| $ | 1.65 |  |  | $ | 1.64 |  |  | $ | 1.63 |  |  | $ | 1.62 |  |  | $ | 1.43 |  |  | $ | 1.42 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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