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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 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 459,614 | $ 403,939
Percentage of total Fair Value | 100.00% | 100.00%
Comparable Ratings, AAA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 43,819 | $ 39,657
Percentage of total Fair Value | 9.50% | 9.80%
Comparable Ratings, AA Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 233,077 | $ 220,693
Percentage of total Fair Value | 50.80% | 54.80%
Comparable Ratings, A Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 117,665 | $ 83,734
Percentage of total Fair Value | 25.60% | 20.70%
Comparable Ratings, BBB Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 47,328 | $ 47,003
Percentage of total Fair Value | 10.30% | 11.60%
Comparable Ratings, BB+ and Below Rating [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 4,719 | $ 3,401
Percentage of total Fair Value | 1.00% | 0.80%
Comparable Ratings, No Rating Available [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value | $ 13,006 | $ 9,451
Percentage of total Fair Value | 2.80% | 2.30%

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