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Investments and Fair Value Measurements - Schedule of Maturity Profile of Held-to-maturity Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investments Debt And Equity Securities [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 671 686
Held-to-maturity due over ten years 11,474 11,062
Held-to-maturity total $ 12,145 $ 11,748