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Stock-Based Compensation - Weighted Average Period for Recognition of Unrecognized Compensation Cost for Stock Options and Restricted Stock (Detail)
9 Months Ended
Sep. 30, 2015
Stock options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average period 0 years
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average period 1 year 4 months 24 days