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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, 2014 Security | Dec. 31, 2013 Security
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Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | 90 | 95
Less than 12 months, Fair value | $ 126,496 | $ 227,241
Less than 12 months, Unrealized losses | (682) | (4,153)
12 months or longer, Number of issues | 27 | 0
12 months or longer, Fair value | 84,729 | 0
12 months or longer, Unrealized losses | (2,330) | 0
U.S. Government Obligations and Agencies [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | 2 | 6
Less than 12 months, Fair value | 17,473 | 71,042
Less than 12 months, Unrealized losses | (152) | (1,033)
12 months or longer, Number of issues | 4 | 0
12 months or longer, Fair value | 33,950 | 0
12 months or longer, Unrealized losses | (732) | 0
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | 42 | 55
Less than 12 months, Fair value | 35,635 | 65,926
Less than 12 months, Unrealized losses | (153) | (770)
12 months or longer, Number of issues | 13 | 0
12 months or longer, Fair value | 16,301 | 0
12 months or longer, Unrealized losses | (172) | 0
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 | 14 | 16
Less than 12 months, Fair value | 35,116 | 67,110
Less than 12 months, Unrealized losses | (221) | (577)
12 months or longer, Number of issues | 7 | 0
12 months or longer, Fair value | 24,775 | 0
12 months or longer, Unrealized losses | (281) | 0
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | 26 |
Less than 12 months, Fair value | 2,681 |
Less than 12 months, Unrealized losses | (32) |
12 months or longer, Number of issues | 0 |
12 months or longer, Fair value | 0 |
12 months or longer, Unrealized losses | 0 |
Common Stock [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | 3 | 13
Less than 12 months, Fair value | 131 | 3,517
Less than 12 months, Unrealized losses | (27) | (121)
12 months or longer, Number of issues | 2 | 0
12 months or longer, Fair value | 107 | 0
12 months or longer, Unrealized losses | (55) | 0
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | 2 | 5
Less than 12 months, Fair value | 10,487 | 19,646
Less than 12 months, Unrealized losses | (70) | (1,652)
12 months or longer, Number of issues | 1 | 0
12 months or longer, Fair value | 9,596 | 0
12 months or longer, Unrealized losses | (1,090) | 0
Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | 1 |
Less than 12 months, Fair value | 24,973 |
Less than 12 months, Unrealized losses | (27) |
12 months or longer, Number of issues | 0 |
12 months or longer, Fair value | 0 |
12 months or longer, Unrealized losses | $ 0 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous 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)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous 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)(2) -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 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 Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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