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Fair Value of Options Granted, Excluding Stock Option Grant Program of Nonemployee Directors and Executives, Estimated at Date of Grant Using Black Scholes Merton Option Pricing Model (Detail) - $ / shares
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 volatility, minimum 55.00% 55.00% 55.00% 53.00%
Expected volatility, maximum     56.00% 55.00%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Risk-free interest rate, minimum 1.03% 1.46% 1.03% 1.29%
Risk-free interest rate, maximum 1.19% 1.60% 1.48% 1.60%
Weighted-average fair value of options granted $ 11.11 $ 20.88 $ 13.98 $ 14.40
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average expected life 3 years 6 months 4 years 6 months 29 days 3 years 6 months 4 years 6 months 29 days
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average expected life     4 years 6 months 29 days