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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) $ in Thousands | Mar. 31, 2016 USD ($) Security | Dec. 31, 2015 USD ($) Security
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 58 | 174
Less than 12 months, Fair value | $ 123,085 | $ 359,017
Less than 12 months, Unrealized losses | $ (1,301) | $ (3,143)
12 months or longer, Number of issues | Security | 19 | 17
12 months or longer, Fair value | $ 32,630 | $ 30,080
12 months or longer, Unrealized losses | $ (3,438) | $ (4,078)
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 | Security | 2 | 10
Less than 12 months, Fair value | $ 28,934 | $ 121,912
Less than 12 months, Unrealized losses | $ (26) | $ (690)
12 months or longer, Number of issues | Security | 2 | 2
12 months or longer, Fair value | $ 3,506 | $ 3,429
12 months or longer, Unrealized losses | $ (64) | $ (177)
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 28 | 101
Less than 12 months, Fair value | $ 24,139 | $ 90,717
Less than 12 months, Unrealized losses | $ (304) | $ (927)
12 months or longer, Number of issues | Security | 7 | 6
12 months or longer, Fair value | $ 7,826 | $ 4,789
12 months or longer, Unrealized losses | $ (145) | $ (114)
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 | Security | 17 | 51
Less than 12 months, Fair value | $ 32,977 | $ 118,743
Less than 12 months, Unrealized losses | $ (198) | $ (974)
12 months or longer, Number of issues | Security | 5 | 6
12 months or longer, Fair value | $ 12,486 | $ 13,902
12 months or longer, Unrealized losses | $ (118) | $ (291)
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 5 | 5
Less than 12 months, Fair value | $ 2,149 | $ 764
Less than 12 months, Unrealized losses | $ (9) | $ (29)
12 months or longer, Number of issues | Security | 2 |
12 months or longer, Fair value | $ 257 |
12 months or longer, Unrealized losses | $ (5) |
Other [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security |  | 1
Less than 12 months, Fair value |  | $ 4,999
Less than 12 months, Unrealized losses |  | $ (1)
Common Stock [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 1 | 3
Less than 12 months, Fair value | $ 67 | $ 8,690
Less than 12 months, Unrealized losses | $ (13) | $ (148)
12 months or longer, Number of issues | Security | 2 | 2
12 months or longer, Fair value | $ 119 | $ 93
12 months or longer, Unrealized losses | $ (96) | $ (96)
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 5 | 3
Less than 12 months, Fair value | $ 34,819 | $ 13,192
Less than 12 months, Unrealized losses | $ (751) | $ (374)
12 months or longer, Number of issues | Security | 1 | 1
12 months or longer, Fair value | $ 8,436 | $ 7,867
12 months or longer, Unrealized losses | $ (3,010) | $ (3,400)

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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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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 + 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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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 + 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 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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 + 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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- 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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