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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) $ in Thousands | Dec. 31, 2017 USD ($) Security | Dec. 31, 2016 USD ($) Security
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Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 311 | 323
Less than 12 months, Fair value | $ 389,066 | $ 430,540
Less than 12 months, Unrealized losses | $ (6,314) | $ (8,415)
12 months or longer, Number of issues | Security | 116 | 15
12 months or longer, Fair value | $ 181,695 | $ 28,018
12 months or longer, Unrealized losses | $ (5,697) | (3,195)
Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
12 months or longer, Fair value |  | $ 9,200
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 | 7 | 11
Less than 12 months, Fair value | $ 35,464 | $ 70,453
Less than 12 months, Unrealized losses | $ (301) | $ (608)
12 months or longer, Number of issues | Security | 9 | 2
12 months or longer, Fair value | $ 24,140 | $ 3,504
12 months or longer, Unrealized losses | $ (576) | $ (62)
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 159 | 116
Less than 12 months, Fair value | $ 142,208 | $ 96,379
Less than 12 months, Unrealized losses | $ (792) | $ (1,219)
12 months or longer, Number of issues | Security | 39 | 4
12 months or longer, Fair value | $ 29,796 | $ 3,250
12 months or longer, Unrealized losses | $ (516) | $ (80)
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 | 83 | 73
Less than 12 months, Fair value | $ 137,481 | $ 149,928
Less than 12 months, Unrealized losses | $ (955) | $ (1,923)
12 months or longer, Number of issues | Security | 37 | 5
12 months or longer, Fair value | $ 70,218 | $ 9,660
12 months or longer, Unrealized losses | $ (1,568) | $ (115)
Municipal Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 36 | 69
Less than 12 months, Fair value | $ 28,265 | $ 79,402
Less than 12 months, Unrealized losses | $ (246) | $ (3,726)
12 months or longer, Number of issues | Security | 30 |
12 months or longer, Fair value | $ 48,370 |
12 months or longer, Unrealized losses | $ (941) |
Redeemable Preferred Stock [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 21 | 50
Less than 12 months, Fair value | $ 2,464 | $ 6,340
Less than 12 months, Unrealized losses | $ (65) | $ (158)
Common Stock [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 2 | 1
Less than 12 months, Fair value | $ 17,846 | $ 18
Less than 12 months, Unrealized losses | $ (3,820) | $ (7)
12 months or longer, Number of issues | Security |  | 2
12 months or longer, Fair value |  | $ 75
12 months or longer, Unrealized losses |  | $ (115)
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 | $ 25,338 | $ 28,020
Less than 12 months, Unrealized losses | $ (135) | $ (774)
12 months or longer, Number of issues | Security | 1 | 2
12 months or longer, Fair value | $ 9,171 | $ 11,529
12 months or longer, Unrealized losses | $ (2,096) | $ (2,823)

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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=82897076&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=82897076&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=82897076&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=82897076&loc=d3e27337-111563 + Details
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