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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands | Mar. 31, 2018 USD ($) Security | Dec. 31, 2017 USD ($) Security
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Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 498 | 306
Less than 12 months, Fair value | $ 412,838 | $ 345,882
Less than 12 months, Unrealized losses | $ (6,147) | $ (2,359)
12 months or longer, Number of issues | Security | 87 | 115
12 months or longer, Fair value | $ 123,393 | $ 172,524
12 months or longer, Unrealized losses | $ (4,231) | $ (3,601)
U.S. Government Obligations and Agencies [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 10 | 7
Less than 12 months, Fair value | $ 40,203 | $ 35,464
Less than 12 months, Unrealized losses | $ (553) | $ (301)
12 months or longer, Number of issues | Security | 5 | 9
12 months or longer, Fair value | $ 23,590 | $ 24,140
12 months or longer, Unrealized losses | $ (723) | $ (576)
Corporate Bonds [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 314 | 159
Less than 12 months, Fair value | $ 226,028 | $ 142,208
Less than 12 months, Unrealized losses | $ (3,328) | $ (792)
12 months or longer, Number of issues | Security | 35 | 39
12 months or longer, Fair value | $ 31,603 | $ 29,796
12 months or longer, Unrealized losses | $ (1,005) | $ (516)
Mortgage-Backed and Asset-Backed Securities [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 102 | 83
Less than 12 months, Fair value | $ 140,047 | $ 137,481
Less than 12 months, Unrealized losses | $ (2,090) | $ (955)
12 months or longer, Number of issues | Security | 47 | 37
12 months or longer, Fair value | $ 68,200 | $ 70,218
12 months or longer, Unrealized losses | $ (2,503) | $ (1,568)
Municipal Bonds [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 6 | 36
Less than 12 months, Fair value | $ 3,289 | $ 28,265
Less than 12 months, Unrealized losses | $ (47) | $ (246)
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] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 66 | 21
Less than 12 months, Fair value | $ 3,271 | $ 2,464
Less than 12 months, Unrealized losses | $ (129) | $ (65)

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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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