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Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items] |  |
Net unrealized losses recognized | $ 45,004 | $ 44,030
Fair value of securities held on deposit | 20,692 | 17,867
Unrealized losses included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residential-mortgage-backed securities | 30,492 | 234,795
Impairment losses on operations | 22,807 | 17,966
Net realized gains on available-for-sale securities | 22,807 | 17,966
Net Investment Income [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities on fixed maturity | 4,602,958 | 1,803,964
Gross gains on available-for-sale securities | 295,923 | 41,989
Gross losses on available-for-sale securities | 13,842 | 17,109
Non-agency residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cumulative unrealized gains included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residential-mortgage-backed securities | 851 | 524
Cumulative unrealized losses included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residential-mortgage-backed securities | 1,880 | 24
Unrealized losses included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residential-mortgage-backed securities | 4,262 | 23,120
Impairment losses on operations | 7,531 | 5,059
Insurance and Financial Services [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value on securities | 1,192 | 31,320
Percentage of amortized cost | 20.00% |
Percentage of carrying values of all investments | 1.00% |
Credit losses in operations | 22,807 | 17,966
Credit impairments | 5,712 | 5,059
Change-of-intent impairments | 17,095 | 12,907
Impairment losses on operations | 1,529 | 500
Amortized cost on other-than temporary impairments | 162,349 | 103,312
Fair value on other than temporary impairments | $ 138,013 | $ 85,846

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of other than temporary impairment losses on investments in debt securities categorized as Held-to-maturity which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) of investments in debt securities due to credit losses and other than temporary impairments due to other than credit losses when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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