XML 158 R61.htm IDEA: XBRL DOCUMENT v2.4.0.8
Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income $ 7,320 $ 18,572 $ 13,081 $ 41,340
Denominator:        
Shares used in net income per common share - basic 53,054,000 52,679,000 52,914,000 52,591,000
Effect of dilutive securities:        
Stock options, restricted stock and employee stock purchase plan 304,000 527,000 445,000 623,000
Shares used in net income per common share - diluted 53,358,000 53,206,000 53,359,000 53,214,000
Net income per common share:        
Basic $ 0.14 $ 0.35 $ 0.25 $ 0.79
Diluted $ 0.14 $ 0.35 $ 0.25 $ 0.78