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Credit Losses Recognized in Earnings for Debt Securities Where Portion of OTTI Recognized in OCI (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |
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Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |  |  |  |  |  |
Beginning balance | $ 8,284 | [1] | $ 7,798 | [1] | $ 7,478 | $ 7,478 | [1] | $ 7,478 | [1]
Additions for credit losses on securities previously recognized | 219 |  | 705 |  |  |  |  |  |
Ending balance | $ 8,503 |  | $ 8,503 |  | $ 7,478 | $ 7,478 | [1] | $ 7,478 | [1]
[1] | The beginning balance includes credit related losses included in OTTI charges recognized on debt securities in prior periods.

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- Definition This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 + Details
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- Definition The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 + Details
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