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Assumptions to Estimate Fair Value for Stock Options at Grant Date (Detail) - Time Vested Stock Options
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected life (in years)   4 years   4 years
Risk-free interest rate   1.45%   1.26%
Risk-free interest rate, minimum 1.15%   1.13%  
Risk-free interest rate, maximum 1.56%   1.56%  
Expected volatility   62.00%    
Expected volatility, minimum 59.00%   59.00% 55.00%
Expected volatility, maximum 60.00%   65.00% 62.00%
Expected dividend yield 0.00% 0.76%   0.76%
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected life (in years) 4 years   4 years  
Expected dividend yield     0.00%  
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected life (in years) 6 years 3 months   6 years 3 months  
Expected dividend yield     0.36%