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Consolidating financial information (Details 3) - HECO (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Other long-term assets |  |  |  |
Total assets | $ 10,238,145 | $ 10,149,132 |  |
Capitalization |  |  |  |
Cumulative preferred stock - not subject to mandatory redemption |  |  |  |
Current liabilities |  |  |  |
Interest and preferred dividends payable | 25,503 | 26,258 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 474,197 | 439,329 |  |
Contributions in aid of construction | 419,337 | 405,520 |  |
Total liabilities and shareholders' equity | 10,238,145 | 10,149,132 |  |
HECO |  |  |  |
Utility plant, at cost |  |  |  |
Land | 43,424 | 43,370 |  |
Plant and equipment | 3,423,045 | 3,325,862 |  |
Less accumulated depreciation | (1,208,090) | (1,185,899) |  |
Construction in progress | 131,745 | 130,143 |  |
Net utility plant | 2,390,124 | 2,313,476 |  |
Investment in wholly owned subsidiaries, at equity | 503,388 | 497,939 |  |
Current assets |  |  |  |
Cash and cash equivalents | 4,914 | 8,265 | 2,423 | 44,819
Advances to affiliates | 18,000 | 9,400 |  |
Customer accounts receivable, net | 137,171 | 154,316 |  |
Accrued unbilled revenues, net | 102,695 | 100,600 |  |
Other accounts receivable, net | 15,027 | 33,313 |  |
Fuel oil stock, at average cost | 84,748 | 123,176 |  |
Materials and supplies, at average cost | 35,848 | 31,779 |  |
Prepayments and other | 26,194 | 21,708 |  |
Regulatory assets | 51,214 | 42,675 |  |
Total current assets | 475,811 | 525,232 |  |
Other long-term assets |  |  |  |
Regulatory assets | 606,971 | 601,451 |  |
Unamortized debt expense | 6,655 | 7,042 |  |
Other | 45,995 | 46,586 |  |
Total other long-term assets | 659,621 | 655,079 |  |
Total assets | 4,028,944 | 3,991,726 |  |
Capitalization |  |  |  |
Common stock equity | 1,484,504 | 1,472,136 |  |
Cumulative preferred stock - not subject to mandatory redemption | 22,293 | 22,293 |  |
Long-term debt, net | 780,546 | 780,546 |  |
Total capitalization | 2,287,343 | 2,274,975 |  |
Current liabilities |  |  |  |
Short-term borrowings from nonaffiliates | 53,992 |  |  |
Short-term borrowings from affiliate | 9,600 | 18,050 |  |
Accounts payable | 101,725 | 134,651 |  |
Interest and preferred dividends payable | 13,805 | 14,479 |  |
Taxes accrued | 152,905 | 174,477 |  |
Other | 51,807 | 47,203 |  |
Total current liabilities | 383,834 | 388,860 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 330,551 | 302,569 |  |
Regulatory liabilities | 222,193 | 218,437 |  |
Unamortized tax credits | 42,396 | 39,827 |  |
Defined benefit pension and other postretirement benefit plans liability | 449,039 | 459,765 |  |
Other | 65,242 | 68,783 |  |
Total deferred credits and other liabilities | 1,109,421 | 1,089,381 |  |
Contributions in aid of construction | 248,346 | 238,510 |  |
Total liabilities and shareholders' equity | 4,028,944 | 3,991,726 |  |
HELCO |  |  |  |
Utility plant, at cost |  |  |  |
Land | 5,182 | 5,182 |  |
Plant and equipment | 1,095,425 | 1,086,048 |  |
Less accumulated depreciation | (445,035) | (433,531) |  |
Construction in progress | 21,635 | 12,126 |  |
Net utility plant | 677,207 | 669,825 |  |
Current assets |  |  |  |
Cash and cash equivalents | 3,401 | 5,441 | 2,934 | 3,383
Advances to affiliates | 9,600 | 18,050 |  |
Customer accounts receivable, net | 30,867 | 29,772 |  |
Accrued unbilled revenues, net | 17,241 | 14,393 |  |
Other accounts receivable, net | 2,308 | 1,122 |  |
Fuel oil stock, at average cost | 9,673 | 15,485 |  |
Materials and supplies, at average cost | 6,816 | 5,336 |  |
Prepayments and other | 5,805 | 5,146 |  |
Regulatory assets | 5,815 | 4,056 |  |
Total current assets | 91,526 | 98,801 |  |
Other long-term assets |  |  |  |
Regulatory assets | 110,163 | 109,815 |  |
Unamortized debt expense | 1,943 | 2,066 |  |
Other | 9,281 | 9,871 |  |
Total other long-term assets | 121,387 | 121,752 |  |
Total assets | 890,120 | 890,378 |  |
Capitalization |  |  |  |
Common stock equity | 271,013 | 268,908 |  |
Cumulative preferred stock - not subject to mandatory redemption | 7,000 | 7,000 |  |
Long-term debt, net | 201,331 | 201,326 |  |
Total capitalization | 479,344 | 477,234 |  |
Current liabilities |  |  |  |
Accounts payable | 23,747 | 27,457 |  |
Interest and preferred dividends payable | 4,105 | 4,027 |  |
Taxes accrued | 33,299 | 38,778 |  |
Other | 9,564 | 10,310 |  |
Total current liabilities | 70,715 | 80,572 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 74,285 | 68,479 |  |
Regulatory liabilities | 70,171 | 67,359 |  |
Unamortized tax credits | 13,508 | 13,450 |  |
Defined benefit pension and other postretirement benefit plans liability | 78,265 | 80,686 |  |
Other | 16,146 | 17,799 |  |
Total deferred credits and other liabilities | 252,375 | 247,773 |  |
Contributions in aid of construction | 87,686 | 84,799 |  |
Total liabilities and shareholders' equity | 890,120 | 890,378 |  |
MECO |  |  |  |
Utility plant, at cost |  |  |  |
Land | 3,016 | 3,016 |  |
Plant and equipment | 973,648 | 952,490 |  |
Less accumulated depreciation | (429,407) | (421,359) |  |
Construction in progress | 13,522 | 9,109 |  |
Net utility plant | 560,779 | 543,256 |  |
Current assets |  |  |  |
Cash and cash equivalents | 199 | 3,349 | 475 | 496
Customer accounts receivable, net | 28,605 | 26,691 |  |
Accrued unbilled revenues, net | 19,251 | 19,305 |  |
Other accounts receivable, net | 1,420 | 3,016 |  |
Fuel oil stock, at average cost | 23,024 | 22,758 |  |
Materials and supplies, at average cost | 15,560 | 13,970 |  |
Prepayments and other | 6,385 | 6,011 |  |
Regulatory assets | 6,643 | 4,536 |  |
Total current assets | 101,087 | 99,636 |  |
Other long-term assets |  |  |  |
Regulatory assets | 104,219 | 102,063 |  |
Unamortized debt expense | 1,350 | 1,446 |  |
Other | 14,984 | 14,848 |  |
Total other long-term assets | 120,553 | 118,357 |  |
Total assets | 782,419 | 761,249 |  |
Capitalization |  |  |  |
Common stock equity | 232,272 | 228,927 |  |
Cumulative preferred stock - not subject to mandatory redemption | 5,000 | 5,000 |  |
Long-term debt, net | 166,000 | 166,000 |  |
Total capitalization | 403,272 | 399,927 |  |
Current liabilities |  |  |  |
Short-term borrowings from affiliate | 18,000 | 9,400 |  |
Accounts payable | 25,405 | 24,716 |  |
Interest and preferred dividends payable | 2,427 | 2,593 |  |
Taxes accrued | 32,646 | 37,811 |  |
Other | 25,291 | 14,634 |  |
Total current liabilities | 103,769 | 89,154 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 52,116 | 46,563 |  |
Regulatory liabilities | 34,890 | 36,278 |  |
Unamortized tax credits | 13,622 | 13,307 |  |
Defined benefit pension and other postretirement benefit plans liability | 77,722 | 79,754 |  |
Other | 13,723 | 14,055 |  |
Total deferred credits and other liabilities | 192,073 | 189,957 |  |
Contributions in aid of construction | 83,305 | 82,211 |  |
Total liabilities and shareholders' equity | 782,419 | 761,249 |  |
Other subsidiaries |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 103 | 104 | 105 | 108
Total current assets | 103 | 104 |  |
Other long-term assets |  |  |  |
Total assets | 103 | 104 |  |
Capitalization |  |  |  |
Common stock equity | 103 | 104 |  |
Total capitalization | 103 | 104 |  |
Deferred credits and other liabilities |  |  |  |
Total liabilities and shareholders' equity | 103 | 104 |  |
Consolidating adjustments |  |  |  |
Utility plant, at cost |  |  |  |
Investment in wholly owned subsidiaries, at equity | (503,388) | (497,939) |  |
Current assets |  |  |  |
Advances to affiliates | (27,600) | (27,450) |  |
Other accounts receivable, net | (8,696) | (9,275) |  |
Prepayments and other | (83) |  |  |
Total current assets | (36,379) | (36,725) |  |
Other long-term assets |  |  |  |
Total assets | (539,767) | (534,664) |  |
Capitalization |  |  |  |
Common stock equity | (503,388) | (497,939) |  |
Total capitalization | (503,388) | (497,939) |  |
Current liabilities |  |  |  |
Short-term borrowings from affiliate | (27,600) | (27,450) |  |
Interest and preferred dividends payable | (12) | (7) |  |
Other | (8,767) | (9,268) |  |
Total current liabilities | (36,379) | (36,725) |  |
Deferred credits and other liabilities |  |  |  |
Total liabilities and shareholders' equity | (539,767) | (534,664) |  |
HECO Consolidated |  |  |  |
Utility plant, at cost |  |  |  |
Land | 51,622 | 51,568 |  |
Plant and equipment | 5,492,118 | 5,364,400 |  |
Less accumulated depreciation | (2,082,532) | (2,040,789) |  |
Construction in progress | 166,902 | 151,378 |  |
Net utility plant | 3,628,110 | 3,526,557 |  |
Current assets |  |  |  |
Cash and cash equivalents | 8,617 | 17,159 | 5,937 | 48,806
Customer accounts receivable, net | 196,643 | 210,779 |  |
Accrued unbilled revenues, net | 139,187 | 134,298 |  |
Other accounts receivable, net | 10,059 | 28,176 |  |
Fuel oil stock, at average cost | 117,445 | 161,419 |  |
Materials and supplies, at average cost | 58,224 | 51,085 |  |
Prepayments and other | 38,301 | 32,865 |  |
Regulatory assets | 63,672 | 51,267 |  |
Total current assets | 632,148 | 687,048 |  |
Other long-term assets |  |  |  |
Regulatory assets | 821,353 | 813,329 |  |
Unamortized debt expense | 9,948 | 10,554 |  |
Other | 70,260 | 71,305 |  |
Total other long-term assets | 901,561 | 895,188 |  |
Total assets | 5,161,819 | 5,108,793 |  |
Capitalization |  |  |  |
Common stock equity | 1,484,504 | 1,472,136 |  |
Cumulative preferred stock - not subject to mandatory redemption | 34,293 | 34,293 |  |
Long-term debt, net | 1,147,877 | 1,147,872 |  |
Total capitalization | 2,666,674 | 2,654,301 |  |
Current liabilities |  |  |  |
Short-term borrowings from nonaffiliates | 53,992 |  |  |
Accounts payable | 150,877 | 186,824 |  |
Interest and preferred dividends payable | 20,325 | 21,092 |  |
Taxes accrued | 218,850 | 251,066 |  |
Other | 77,895 | 62,879 |  |
Total current liabilities | 521,939 | 521,861 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 456,952 | 417,611 |  |
Regulatory liabilities | 327,254 | 322,074 |  |
Unamortized tax credits | 69,526 | 66,584 |  |
Defined benefit pension and other postretirement benefit plans liability | 605,026 | 620,205 |  |
Other | 95,111 | 100,637 |  |
Total deferred credits and other liabilities | 1,553,869 | 1,527,111 |  |
Contributions in aid of construction | 419,337 | 405,520 |  |
Total liabilities and shareholders' equity | $ 5,161,819 | $ 5,108,793 |  |

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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount due for services rendered or products shipped, but not yet billed, recognized in conformity with revenue recognition criteria. This element is distinct from unbilled contracts receivables because this is based on noncontract transactions. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant