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Stock Purchase - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Equity [Line Items]          
Repurchased shares of common stock 0 0 61,500 0  
Repurchased common stock value         $ 973
Former Director [Member]          
Equity [Line Items]          
Repurchased common stock value     $ 1,000