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Investments - Schedule of Credit Quality of Investment Available-for-sale Debt Securities With Contractual Maturities or The Issuer of Such Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 644,238 | $ 649,334
Percentage of Total Fair Value | 100.00% | 100.00%
Comparable Ratings, AAA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 126,242 | $ 135,237
Percentage of Total Fair Value | 19.60% | 20.80%
Comparable Ratings, AA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 250,660 | $ 292,496
Percentage of Total Fair Value | 38.90% | 45.10%
Comparable Ratings, A Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 152,908 | $ 134,505
Percentage of Total Fair Value | 23.70% | 20.70%
Comparable Ratings, BBB Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 109,087 | $ 80,566
Percentage of Total Fair Value | 16.90% | 12.40%
Comparable Ratings, BB+ and Below Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 2,945 | $ 2,919
Percentage of Total Fair Value | 0.50% | 0.40%
Comparable Ratings, No Rating Available [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 2,396 | $ 3,611
Percentage of Total Fair Value | 0.40% | 0.60%

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