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Investments - Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities by Contractual Maturity (Total Held-to-maturity Securities) (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Investment [Line Items] |  |
Total, Amortized Cost Basis | $ 550,153 | $ 583,287
Total, Fair Value | 576,989 | 627,349
Carrying Amount [Member] |  |
Investment [Line Items] |  |
Less than one year, Amortized Cost Basis | 63,140 |
One to five years, Amortized Cost Basis | 145,838 |
Five to ten years, Amortized Cost Basis | 130,159 |
More than ten years, Amortized Cost Basis | 132,205 |
Total, Amortized Cost Basis | 550,153 | 583,287
Fair Value [Member] |  |
Investment [Line Items] |  |
Less than one year, Fair Value | 63,427 |
One to five years, Fair Value | 153,601 |
Five to ten years, Fair Value | 140,059 |
More than ten years, Fair Value | 135,219 |
Total, Fair Value | 576,989 |
U.S. agency-based mortgage-backed securities [Member] |  |
Investment [Line Items] |  |
Total, Amortized Cost Basis | 23,876 | 32,984
Total, Fair Value | 25,842 | 36,042
U.S. agency-based mortgage-backed securities [Member] | Carrying Amount [Member] |  |
Investment [Line Items] |  |
Held-to-maturity, Amortized Cost | 23,876 |
U.S. agency-based mortgage-backed securities [Member] | Fair Value [Member] |  |
Investment [Line Items] |  |
Held-to-maturity, Fair Value | 25,842 |
Commercial mortgage-backed securities [Member] |  |
Investment [Line Items] |  |
Total, Amortized Cost Basis | 51,414 | 51,529
Total, Fair Value | 55,275 | 57,962
Commercial mortgage-backed securities [Member] | Carrying Amount [Member] |  |
Investment [Line Items] |  |
Held-to-maturity, Amortized Cost | 51,414 |
Commercial mortgage-backed securities [Member] | Fair Value [Member] |  |
Investment [Line Items] |  |
Held-to-maturity, Fair Value | 55,275 |
Asset-backed securities [Member] |  |
Investment [Line Items] |  |
Total, Amortized Cost Basis | 3,521 | 4,229
Total, Fair Value | 3,566 | 4,245
Asset-backed securities [Member] | Carrying Amount [Member] |  |
Investment [Line Items] |  |
Held-to-maturity, Amortized Cost | 3,521 |
Asset-backed securities [Member] | Fair Value [Member] |  |
Investment [Line Items] |  |
Held-to-maturity, Fair Value | $ 3,566 |

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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of held-to-maturity debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Amount of held-to-maturity debt securities at fair value maturing after the tenth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(4) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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