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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands | Sep. 30, 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 | 608 | 306
Less than 12 months, Fair value | $ 476,031 | $ 345,882
Less than 12 months, Unrealized losses | $ (6,832) | $ (2,359)
12 months or longer, Number of issues | Security | 176 | 115
12 months or longer, Fair value | $ 201,926 | $ 172,524
12 months or longer, Unrealized losses | $ (7,029) | $ (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 | 5 | 7
Less than 12 months, Fair value | $ 15,734 | $ 35,464
Less than 12 months, Unrealized losses | $ (313) | $ (301)
12 months or longer, Number of issues | Security | 11 | 9
12 months or longer, Fair value | $ 40,389 | $ 24,140
12 months or longer, Unrealized losses | $ (1,146) | $ (576)
Corporate Bonds [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 413 | 159
Less than 12 months, Fair value | $ 316,750 | $ 142,208
Less than 12 months, Unrealized losses | $ (4,599) | $ (792)
12 months or longer, Number of issues | Security | 66 | 39
12 months or longer, Fair value | $ 51,245 | $ 29,796
12 months or longer, Unrealized losses | $ (1,566) | $ (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 | 86 | 83
Less than 12 months, Fair value | $ 135,530 | $ 137,481
Less than 12 months, Unrealized losses | $ (1,643) | $ (955)
12 months or longer, Number of issues | Security | 98 | 37
12 months or longer, Fair value | $ 109,884 | $ 70,218
12 months or longer, Unrealized losses | $ (4,280) | $ (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 | $ 3,278 | $ 28,265
Less than 12 months, Unrealized losses | $ (123) | $ (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 | 98 | 21
Less than 12 months, Fair value | $ 4,739 | $ 2,464
Less than 12 months, Unrealized losses | $ (154) | $ (65)
12 months or longer, Number of issues | Security | 1 |
12 months or longer, Fair value | $ 408 |
12 months or longer, Unrealized losses | $ (37) |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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