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Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]        
Employee deferrals deemed vested percentage upon contribution     100.00%  
Company's contributions to the plan $ 300 $ 200 $ 900 $ 600
Company's expected contributions to the plan $ 8   $ 31  
Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Deferral percentage of base salary     80.00%  
Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Deferral percentage of other compensation     100.00%