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Investments and Fair Value Measurements - Schedule of Investments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-Maturity debt instruments $ 23,689 $ 13,990
Federal Agency [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-Maturity debt instruments $ 23,689 $ 13,990