Investments and Fair Value Measurements - Schedule of Maturity Profile of Investments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
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	686	727
Held-to-maturity due over ten years	11,062	10,309
Held-to-maturity total	$ 11,748	$ 11,036