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Investments - Schedule of Credit Quality of Available-for-sale Debt Securities With Contractual Maturities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 656,762 | $ 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 | $ 310,359 | $ 317,313
Percentage of Total Fair Value | 47.30% | 48.90%
Comparable Ratings, AA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 73,207 | $ 129,573
Percentage of Total Fair Value | 11.10% | 20.00%
Comparable Ratings, A Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 182,479 | $ 146,749
Percentage of Total Fair Value | 27.80% | 22.60%
Comparable Ratings, BBB Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 87,007 | $ 51,020
Percentage of Total Fair Value | 13.30% | 7.80%
Comparable Ratings, BB+ and Below Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 114 | $ 1,569
Percentage of Total Fair Value | 0.00% | 0.20%
Comparable Ratings, No Rating Available [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 3,596 | $ 3,110
Percentage of Total Fair Value | 0.50% | 0.50%

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