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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |
Less unamortized debt issuance costs | $ (2,007,000) | $ (241,000) |
Long-term debt, net | 1,683,797,000 | 1,619,019,000 |
2018 | 54,000,000 |  |
2019 | 4,000,000 |  |
2020 | 100,000,000 |  |
2021 | 54,000,000 |  |
2022 | 206,000,000 |  |
Issuance of common stock, net of expenses |  | 26,844,000 |
Common stock |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Issuance of common stock, net of expenses |  | 26,844,000 |
Hamakua Energy Partners, L.P. (HEP) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Notes receivable converted into equity | 3,600,000 |  |
Self Insured United States Longshore and Horbor Bond |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Maximum undiscounted exposure | 200,000 |  |
Self Insured Automobile Bond |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Maximum undiscounted exposure | 600,000 |  |
Hawaiian Electric Industries, Inc. |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Less unamortized debt issuance costs | (412,000) | (241,000) |
Long-term debt, net | 249,588,000 | 299,759,000 |
2018 | 0 |  |
2019 | 0 |  |
2020 | 0 |  |
2021 | 50,000,000 |  |
2022 | 150,000,000 |  |
Cash dividends paid | 125,000,000 | 130,000,000 | $ 121,000,000
Hawaiian Electric Industries, Inc. | Common stock |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Issuance of common stock, net of expenses | 0 | 17,000,000 | 0
Hawaiian Electric Industries, Inc. | ASB Hawaii, Inc. | Consolidated subsidiary |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Accounts receivable reduction | 2,800,000 | 2,300,000 | 2,300,000
HEI notes payable increase to ASHI | 2,800,000 | 2,300,000 | $ 300,000
Hawaiian Electric Industries, Inc. | HEI loan 2.99%, due 2022 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 150,000,000 | 0 |
Debt instrument, stated interest rate | 2.99% |  |
Hawaiian Electric Industries, Inc. | HEI 5.67% senior notes, due 2021 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 50,000,000 | 50,000,000 |
Debt instrument, stated interest rate | 5.67% |  |
Hawaiian Electric Industries, Inc. | HEI 3.99% senior notes, due 2023 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 50,000,000 | 50,000,000 |
Debt instrument, stated interest rate | 3.99% |  |
Hawaiian Electric Industries, Inc. | HEI Term loans (LIBOR 0.75%), paid in 2017 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Gross long-term debt | $ 0 | $ 200,000,000 |
Hawaiian Electric Industries, Inc. | HEI Term loans (LIBOR 0.75%), paid in 2017 | LIBOR |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Line of credit facility basis point spread | 0.75% |  |

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