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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 Security
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Schedule of Available-for-sale Securities [Line Items] |
Less than 12 months, Number of issues | 119
Less than 12 months, Fair value | $ 274,525
Less than 12 months, Unrealized losses | (3,385)
12 months or longer, Number of issues |
12 months or longer, Fair value |
12 months or longer, Unrealized losses |
US Government and Agency Obligations [Member] | Fixed Maturities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 12 months, Number of issues | 7
Less than 12 months, Fair value | 92,376
Less than 12 months, Unrealized losses | (735)
12 months or longer, Number of issues |
12 months or longer, Fair value |
12 months or longer, Unrealized losses |
Corporate Bonds [Member] | Fixed Maturities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 12 months, Number of issues | 68
Less than 12 months, Fair value | 81,640
Less than 12 months, Unrealized losses | (944)
12 months or longer, Number of issues |
12 months or longer, Fair value |
12 months or longer, Unrealized losses |
Mortgage-Backed and Asset-Backed Securities [Member] | Fixed Maturities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 12 months, Number of issues | 17
Less than 12 months, Fair value | 73,630
Less than 12 months, Unrealized losses | (351)
12 months or longer, Number of issues |
12 months or longer, Fair value |
12 months or longer, Unrealized losses |
Common Stock [Member] | Equity Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 12 months, Number of issues | 22
Less than 12 months, Fair value | 6,449
Less than 12 months, Unrealized losses | (284)
12 months or longer, Number of issues |
12 months or longer, Fair value |
12 months or longer, Unrealized losses |
Mutual Funds [Member] | Equity Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 12 months, Number of issues | 5
Less than 12 months, Fair value | 20,430
Less than 12 months, Unrealized losses | (1,071)
12 months or longer, Number of issues |
12 months or longer, Fair value |
12 months or longer, Unrealized losses |

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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Available for sale securities continuous unrealized loss position less than twelve months aggregate losses accumulated in investments. + References No definition available. + Details
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