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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 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 | 84 | 95
Less than 12 months, Fair value | $ 211,143 | $ 227,241
Less than 12 months, Unrealized losses | (3,430) | (4,153)
12 months or longer, Number of issues |  |
12 months or longer, Fair value |  |
12 months or longer, Unrealized losses |  |
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 | 7 | 6
Less than 12 months, Fair value | 82,798 | 71,042
Less than 12 months, Unrealized losses | (886) | (1,033)
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 | 42 | 55
Less than 12 months, Fair value | 47,773 | 65,926
Less than 12 months, Unrealized losses | (445) | (770)
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 | 16
Less than 12 months, Fair value | 60,261 | 67,110
Less than 12 months, Unrealized losses | (525) | (577)
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 | 14 | 13
Less than 12 months, Fair value | 2,314 | 3,517
Less than 12 months, Unrealized losses | (213) | (121)
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 | 4 | 5
Less than 12 months, Fair value | 17,997 | 19,646
Less than 12 months, Unrealized losses | (1,361) | (1,652)
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 twelve months or longer aggregate losses accumulated in investments. + References No definition available. + Details
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