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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule Of Available For Sale Securities [Line Items] |  |
Fixed Maturities Securities Available for Sale, Due in one year or less, Amortized cost | $ 119,008 |
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost | 222,690 |
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost | 1,465 |
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost | 4,121 |
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost | 6,603 |
Fixed Maturities Securities Available for Sale, Amortized cost, Total | 492,369 |
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value | 119,037 |
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value | 222,847 |
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value | 1,427 |
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value | 4,172 |
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value | 6,624 |
Fixed Maturities Securities Available for Sale, Fair Value, Total | 492,792 | $ 403,939
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Amortized cost | 138,482 |
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value | $ 138,685 |

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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