Annual report pursuant to Section 13 and 15(d)

Stock Option and Purchase Plans - Summary of Weighted-Average Assumptions (Detail)

v2.4.0.8
Stock Option and Purchase Plans - Summary of Weighted-Average Assumptions (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividend Yield 0.00% 0.00% 0.00%
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free Interest Rate 0.88% 0.89% 1.55%
Volatility Factor 0.51% 0.52% 0.52%
Expected Life in Years 5 years 5 years 7 years
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free Interest Rate 2.22% 1.00% 2.82%
Volatility Factor 0.56% 0.64% 0.53%
Expected Life in Years 8 years 8 years 8 years