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Investments and Fair Value Measurements - Schedule of Maturity Profile of Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Held To Maturity Securities Debt Maturities Net Carrying Amount [Abstract]    
Held-to-maturity due within one year      
Held-to-maturity due one year through five years      
Held-to-maturity due five years through ten years 694 727
Held-to-maturity due over ten years 10,909 10,309
Held-to-maturity total $ 11,603 $ 11,036