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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, 2016 | Dec. 31, 2015
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Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 589,363 | $ 441,104
Percentage of Total Fair Value | 100.00% | 100.00%
Comparable Ratings, AAA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 131,260 | $ 103,097
Percentage of Total Fair Value | 22.30% | 23.40%
Comparable Ratings, AA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 275,480 | $ 189,600
Percentage of Total Fair Value | 46.70% | 43.00%
Comparable Ratings, A Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 107,418 | $ 83,850
Percentage of Total Fair Value | 18.20% | 19.00%
Comparable Ratings, BBB Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 67,263 | $ 41,408
Percentage of Total Fair Value | 11.40% | 9.40%
Comparable Ratings, BB and Below Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 3,444 | $ 4,261
Percentage of Total Fair Value | 0.60% | 1.00%
Comparable Ratings, No Rating Available [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 4,498 | $ 18,888
Percentage of Total Fair Value | 0.80% | 4.20%

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