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Investments - Schedule of Credit Quality of Investments With Contractual Maturities (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 352,983	$ 289,418
Moody's, Baa3 Rating
Schedule Of Available For Sale Securities [Line Items]
Fair Value	259
Moody's, Aaa Rating
Schedule Of Available For Sale Securities [Line Items]
Fair Value	$ 7,500

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- Definition

Amount of available for sale securities with contractual maturities.

+ References

No definition available.

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