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Basis of presentation - Restatement and revision of previously filed financial statements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other amortization [1] $ 2,371 $ 1,609
Increase in deferred income taxes [1] 3,828 6,457
Share-based compensation expense [1] 1,754 2,361
Increase in accounts, interest and dividends payable [1] 22,053 15,306
Change in prepaid and accrued income taxes and utility revenue taxes [1] (9,461) (19,474)
Change in other assets and liabilities [1] (25,992) (29,931)
Net cash provided by operating activities [1] 138,610 43,691
Capital expenditures [1] (123,527) (90,442)
Cash flows from investing activities-Other [1] 3,549 343
Net cash used in investing activities [1] (152,045) (98,502)
Cash flows from financing activities-Other [1] (3,965) (3,953)
Net cash provided by financing activities [1] 130,061 103,895
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) (41,000) (16,000)
Accounting Standards Update 2014-01    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Increase in deferred income taxes   6,457
Change in other assets and liabilities   (29,931)
Hawaiian Electric Company, Inc. and Subsidiaries    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other amortization [1] 1,698 1,621
Increase in accounts payable [1] 15,380 8,589
Increase in deferred income taxes [1] 15,132 20,344
Change in prepaid and accrued income taxes and utility revenue taxes [1] (63,696) (47,526)
Change in other assets and liabilities [1] (9,774) (11,324)
Net cash provided by operating activities [1] 97,160 24,907
Capital expenditures [1] (118,874) (89,075)
Cash flows from investing activities-Other 243 343
Net cash used in investing activities [1] (109,486) (81,774)
Cash flows from financing activities-Other [1] (216) (389)
Net cash provided by financing activities [1] 6,684 11,401
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) (41,000) (16,000)
Scenario, Previously Reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other amortization 1,362  
Increase in deferred income taxes 15,265 6,298
Share-based compensation expense 0  
Increase in accounts, interest and dividends payable (42,463) (9,307)
Change in prepaid and accrued income taxes and utility revenue taxes (61,397)  
Change in other assets and liabilities 19,826 (27,208)
Net cash provided by operating activities 76,650 19,421
Capital expenditures (59,011) (65,829)
Cash flows from investing activities-Other 3,281 0
Net cash used in investing activities (87,797) (74,232)
Cash flows from financing activities-Other (6,253)  
Net cash provided by financing activities 127,773  
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) 24,000 9,000
Scenario, Previously Reported | Accounting Standards Update 2014-01    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Share-based compensation expense   0
Change in other assets and liabilities   (27,227)
Scenario, Previously Reported | Hawaiian Electric Company, Inc. and Subsidiaries    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other amortization 689  
Increase in accounts payable (49,136) (16,024)
Change in other assets and liabilities (8,522) (10,981)
Net cash provided by operating activities 32,887 637
Capital expenditures (54,358) (64,462)
Cash flows from investing activities-Other 0 0
Net cash used in investing activities (45,213) (57,504)
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) 24,000 9,000
Difference    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other amortization 1,009  
Increase in deferred income taxes (11,437)  
Share-based compensation expense 1,754 2,361
Increase in accounts, interest and dividends payable 64,516 24,613
Change in prepaid and accrued income taxes and utility revenue taxes 51,936  
Change in other assets and liabilities (45,818) (2,704)
Net cash provided by operating activities 61,960 24,270
Capital expenditures (64,516) (24,613)
Cash flows from investing activities-Other 268 343
Net cash used in investing activities (64,248) (24,270)
Cash flows from financing activities-Other 2,288  
Net cash provided by financing activities 2,288  
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) (65,000) (25,000)
Difference | Hawaiian Electric Company, Inc. and Subsidiaries    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other amortization 1,009  
Increase in accounts payable 64,516 24,613
Change in other assets and liabilities (1,252) (343)
Net cash provided by operating activities 64,273 24,270
Capital expenditures (64,516) (24,613)
Cash flows from investing activities-Other 243 343
Net cash used in investing activities (64,273) (24,270)
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) $ (65,000) $ (25,000)
[1] As restated - See Note 1, “Basis of presentation - Restatement of previously issued financial statements.”