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Financing receivables and Investments - Additional Information (Detail) (USD $)
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9 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2013
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Dec. 31, 2012
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Sep. 30, 2013
Berkshire Hathaway Inc. [Member]
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Sep. 30, 2013
Exelon Corporation [Member]
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May 31, 2013
HA EnergySource [Member]
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Sep. 30, 2013
HA EnergySource [Member]
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Sep. 30, 2013
HA EnergySource [Member]
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| Noncancelable Obligations Future Minimum Payments Due [Line Items] | |||||||
| Deferred funding obligations | $ 77,200,000 | ||||||
| Restricted cash | 38,927,000 | 55,000 | |||||
| Notes receivable - related party | 24,000,000 | 24,800,000 | 24,800,000 | ||||
| Interest rate of related party loan | 15.22% | 6.50% | |||||
| Maturity period of related party loan | May 31, 2018 | ||||||
| Interest paid on the loan | 400,000 | 600,000 | |||||
| Loan proceeds not spent - related party | 14,000,000 | 14,000,000 | |||||
| Debt security, carrying value | 37,000,000 | 35,000,000 | |||||
| Debt security, maturity year | 2035 | 2033 | |||||
| Financing receivable held for sale , carrying value and fair value | $ 21,138,000 | ||||||
| Amortizing government receivables maturity date | 2038-02-28 | ||||||
| X | ||||||||||
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- Definition
Amortizing Government Receivables Maturity Date No definition available.
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| X | ||||||||||
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- Definition
Held to Maturity Securities Year No definition available.
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| X | ||||||||||
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- Definition
Loan Held By Related Party No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of interest expense incurred on a debt or other obligation to related party. No definition available.
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| X | ||||||||||
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- Definition
Amount of loans held for sale, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Date of maturity or expiration of arrangements with a related party (for example, but not limited to, leasing and debt arrangements between related parties), in CCYY-MM-DD format. No definition available.
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| X | ||||||||||
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- Definition
Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties. No definition available.
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| X | ||||||||||
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- Definition
The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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