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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) $ in Thousands | Dec. 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 | 323 | 174
Less than 12 months, Fair value | $ 430,540 | $ 359,017
Less than 12 months, Unrealized losses | $ (8,415) | $ (3,143)
12 months or longer, Number of issues | Security | 15 | 17
12 months or longer, Fair value | $ 28,018 | $ 30,080
12 months or longer, Unrealized losses | (3,195) | $ (4,078)
Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
12 months or longer, Fair value | $ 11,600 |
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 | 11 | 10
Less than 12 months, Fair value | $ 70,453 | $ 121,912
Less than 12 months, Unrealized losses | $ (608) | $ (690)
12 months or longer, Number of issues | Security | 2 | 2
12 months or longer, Fair value | $ 3,504 | $ 3,429
12 months or longer, Unrealized losses | $ (62) | $ (177)
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 116 | 101
Less than 12 months, Fair value | $ 96,379 | $ 90,717
Less than 12 months, Unrealized losses | $ (1,219) | $ (927)
12 months or longer, Number of issues | Security | 4 | 6
12 months or longer, Fair value | $ 3,250 | $ 4,789
12 months or longer, Unrealized losses | $ (80) | $ (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 | 73 | 51
Less than 12 months, Fair value | $ 149,928 | $ 118,743
Less than 12 months, Unrealized losses | $ (1,923) | $ (974)
12 months or longer, Number of issues | Security | 5 | 6
12 months or longer, Fair value | $ 9,660 | $ 13,902
12 months or longer, Unrealized losses | $ (115) | $ (291)
Municipal Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 69 |
Less than 12 months, Fair value | $ 79,402 |
Less than 12 months, Unrealized losses | $ (3,726) |
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 50 | 5
Less than 12 months, Fair value | $ 6,340 | $ 764
Less than 12 months, Unrealized losses | $ (158) | $ (29)
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 | $ 18 | $ 8,690
Less than 12 months, Unrealized losses | $ (7) | $ (148)
12 months or longer, Number of issues | Security | 2 | 2
12 months or longer, Fair value | $ 75 | $ 93
12 months or longer, Unrealized losses | $ (115) | $ (96)
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 3 | 3
Less than 12 months, Fair value | $ 28,020 | $ 13,192
Less than 12 months, Unrealized losses | $ (774) | $ (374)
12 months or longer, Number of issues | Security | 2 | 1
12 months or longer, Fair value | $ 11,529 | $ 7,867
12 months or longer, Unrealized losses | $ (2,823) | $ (3,400)
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)

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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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27337-111563 + Details
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