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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) $ in Thousands | Sep. 30, 2015 USD ($) Security | Dec. 31, 2014 USD ($) Security
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 185 | 108
Less than 12 months, Fair value | $ 170,580 | $ 183,191
Less than 12 months, Unrealized losses | $ (2,685) | $ (702)
12 months or longer, Number of issues | Security | 15 | 24
12 months or longer, Fair value | $ 30,921 | $ 74,973
12 months or longer, Unrealized losses | $ (3,545) | $ (2,799)
Short-term Investments [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 76 | 2
Less than 12 months, Fair value | $ 52,514 | $ 37,490
Less than 12 months, Unrealized losses | $ (2) | $ (10)
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 |  | 3
Less than 12 months, Fair value |  | $ 27,341
Less than 12 months, Unrealized losses |  | $ (55)
12 months or longer, Number of issues | Security | 2 | 4
12 months or longer, Fair value | $ 3,470 | $ 34,050
12 months or longer, Unrealized losses | $ (201) | $ (572)
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 58 | 67
Less than 12 months, Fair value | $ 52,340 | $ 58,271
Less than 12 months, Unrealized losses | $ (608) | $ (238)
12 months or longer, Number of issues | Security | 4 | 12
12 months or longer, Fair value | $ 3,952 | $ 15,105
12 months or longer, Unrealized losses | $ (41) | $ (126)
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 | 14 | 20
Less than 12 months, Fair value | $ 30,805 | $ 48,335
Less than 12 months, Unrealized losses | $ (117) | $ (273)
12 months or longer, Number of issues | Security | 6 | 5
12 months or longer, Fair value | $ 15,504 | $ 16,842
12 months or longer, Unrealized losses | $ (207) | $ (229)
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 30 | 12
Less than 12 months, Fair value | $ 3,789 | $ 1,153
Less than 12 months, Unrealized losses | $ (65) | $ (9)
Common Stock [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 3 | 2
Less than 12 months, Fair value | $ 8,161 | $ 87
Less than 12 months, Unrealized losses | $ (1,168) | $ (20)
12 months or longer, Number of issues | Security | 2 | 2
12 months or longer, Fair value | $ 83 | $ 117
12 months or longer, Unrealized losses | $ (106) | $ (45)
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 4 | 2
Less than 12 months, Fair value | $ 22,971 | $ 10,514
Less than 12 months, Unrealized losses | $ (725) | $ (97)
12 months or longer, Number of issues | Security | 1 | 1
12 months or longer, Fair value | $ 7,912 | $ 8,859
12 months or longer, Unrealized losses | $ (2,990) | $ (1,827)

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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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