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Summary of Gross Unrealized Losses and Fair Values on Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]    
Less than 12 months, Fair Value $ 52,475 $ 28,711
Available-for-sale securities- matures within one year, Gross unrealized losses (353) (241)
12 months or greater, Fair Value 369 489
Available-for-sale securities- matures after one year through three years, Gross unrealized losses $ (1) $ (1)