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Investments - Schedule of Credit Quality of Investment Securities With Contractual Maturities or The Issuer of Such Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 649,334 | $ 589,363
Percentage of Total Fair Value | 100.00% | 100.00%
Comparable Ratings, AAA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 135,237 | $ 131,260
Percentage of Total Fair Value | 20.80% | 22.30%
Comparable Ratings, AA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 292,496 | $ 275,480
Percentage of Total Fair Value | 45.10% | 46.70%
Comparable Ratings, A Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 134,505 | $ 107,418
Percentage of Total Fair Value | 20.70% | 18.20%
Comparable Ratings, BBB Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 80,566 | $ 67,263
Percentage of Total Fair Value | 12.40% | 11.40%
Comparable Ratings, BB and Below Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 2,919 | $ 3,444
Percentage of Total Fair Value | 0.40% | 0.60%
Comparable Ratings, No Rating Available [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 3,611 | $ 4,498
Percentage of Total Fair Value | 0.60% | 0.80%

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