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Available for Sale Securities by Original Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, carrying value $ 30,700 $ 10,268
Due greater than one year and less than five years, carrying value 6,134  
Total available-for-sale securities, carrying value 36,834 10,268
Due in one year or less, fair value 30,701 10,268
Due greater than one year and less than five years, fair value 6,140  
Total available-for-sale securities, fair value $ 36,841 $ 10,268