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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands | Jun. 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 | 528 | 306
Less than 12 months, Fair value | $ 444,952 | $ 345,882
Less than 12 months, Unrealized losses | $ (8,107) | $ (2,359)
12 months or longer, Number of issues | Security | 102 | 115
12 months or longer, Fair value | $ 138,026 | $ 172,524
12 months or longer, Unrealized losses | $ (4,772) | $ (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 | 9 | 7
Less than 12 months, Fair value | $ 35,148 | $ 35,464
Less than 12 months, Unrealized losses | $ (608) | $ (301)
12 months or longer, Number of issues | Security | 8 | 9
12 months or longer, Fair value | $ 22,564 | $ 24,140
12 months or longer, Unrealized losses | $ (766) | $ (576)
Corporate Bonds [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 346 | 159
Less than 12 months, Fair value | $ 266,868 | $ 142,208
Less than 12 months, Unrealized losses | $ (5,103) | $ (792)
12 months or longer, Number of issues | Security | 33 | 39
12 months or longer, Fair value | $ 31,018 | $ 29,796
12 months or longer, Unrealized losses | $ (1,087) | $ (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 | 100 | 83
Less than 12 months, Fair value | $ 135,607 | $ 137,481
Less than 12 months, Unrealized losses | $ (2,172) | $ (955)
12 months or longer, Number of issues | Security | 61 | 37
12 months or longer, Fair value | $ 84,444 | $ 70,218
12 months or longer, Unrealized losses | $ (2,919) | $ (1,568)
Municipal Bonds [Member] | Debt Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Number of issues | Security | 7 | 36
Less than 12 months, Fair value | $ 3,521 | $ 28,265
Less than 12 months, Unrealized losses | $ (81) | $ (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 | $ 3,808 | $ 2,464
Less than 12 months, Unrealized losses | $ (143) | $ (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 No definition available. + 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 No definition available. + 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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