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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Detail) $ in Thousands | Jun. 30, 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 | 283 | 323
Less than 12 months, Fair value | $ 350,085 | $ 430,540
Less than 12 months, Unrealized losses | $ (4,238) | $ (8,415)
12 months or longer, Number of issues | Security | 14 | 15
12 months or longer, Fair value | $ 23,387 | $ 28,018
12 months or longer, Unrealized losses | (2,412) | $ (3,195)
Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
12 months or longer, Fair value | $ 9,142 |
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 | 13 | 11
Less than 12 months, Fair value | $ 55,479 | $ 70,453
Less than 12 months, Unrealized losses | $ (458) | $ (608)
12 months or longer, Number of issues | Security | 2 | 2
12 months or longer, Fair value | $ 3,471 | $ 3,504
12 months or longer, Unrealized losses | $ (87) | $ (62)
Corporate Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 107 | 116
Less than 12 months, Fair value | $ 79,838 | $ 96,379
Less than 12 months, Unrealized losses | $ (640) | $ (1,219)
12 months or longer, Number of issues | Security | 2 | 4
12 months or longer, Fair value | $ 312 | $ 3,250
12 months or longer, Unrealized losses | $ (18) | $ (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 | 94 | 73
Less than 12 months, Fair value | $ 141,724 | $ 149,928
Less than 12 months, Unrealized losses | $ (1,295) | $ (1,923)
12 months or longer, Number of issues | Security | 7 | 5
12 months or longer, Fair value | $ 10,462 | $ 9,660
12 months or longer, Unrealized losses | $ (97) | $ (115)
Municipal Bonds [Member] | Fixed Maturities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 61 | 69
Less than 12 months, Fair value | $ 72,065 | $ 79,402
Less than 12 months, Unrealized losses | $ (1,836) | $ (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 | 8 | 50
Less than 12 months, Fair value | $ 979 | $ 6,340
Less than 12 months, Unrealized losses | $ (9) | $ (158)
Mutual Funds [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security |  | 3
Less than 12 months, Fair value |  | $ 28,020
Less than 12 months, Unrealized losses |  | $ (774)
12 months or longer, Number of issues | Security | 3 | 2
12 months or longer, Fair value | $ 9,142 | $ 11,529
12 months or longer, Unrealized losses | $ (2,210) | $ (2,823)
Common Stock [Member] | Equity Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security |  | 1
Less than 12 months, Fair value |  | $ 18
Less than 12 months, Unrealized losses |  | $ (7)
12 months or longer, Number of issues | Security |  | 2
12 months or longer, Fair value |  | $ 75
12 months or longer, Unrealized losses |  | $ (115)

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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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- 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=82897076&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=82897076&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=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 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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