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Compensation Plans - Summary of Company's Expenses Attributable to 401(k) Plan (Detail) (401(K) Plan, USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
401(K) Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expenses attributable to the 401(k) Plan $ 344,868 $ 301,958 $ 1,002,871 $ 866,740