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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Expenses                      
Depreciation of property, plant and equipment                 $ 160,061 $ 150,389 $ 148,152
Interest expense                 85,556 89,443 96,575
Income before income taxes                 247,747 217,407 216,052
Income tax benefits                 (84,341) (76,859) (75,932)
Net income 39,486 48,707 41,061 34,152 14,309 48,177 39,273 38,789 163,406 140,548 140,120
Hawaiian Electric Industries, Inc.
                      
Revenues                      
Revenues                 288 221 253
Equity in income of subsidiaries                 180,359 157,883 158,722
Expenses                      
Operating, administrative and general                 16,063 16,191 15,401
Depreciation of property, plant and equipment                 596 672 227
Taxes, other than income taxes                 497 421 409
Interest expense                 16,207 16,695 22,013
Income before income taxes                 147,284 124,125 120,925
Income tax benefits                 14,232 14,533 17,305
Net income                 $ 161,516 $ 138,658 $ 138,230