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Investments and Fair Value Measurements - Schedule of Maturity Profile of Investments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity due within one year $ 0 $ 0
Held-to-maturity due one year through five years 9,376 1,409
Held-to-maturity due five years through ten years 825 350
Held-to-maturity due over ten years 11,046 12,231
Held-to-maturity cost or amortized cost $ 21,247 $ 13,990