XML 91 R81.htm IDEA: XBRL DOCUMENT v3.5.0.2
Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net income $ 32,549 $ 29,769 $ 59,322 $ 96,775
Denominator:        
Shares used in net income per common share - basic 53,574,000 53,314,000 53,423,000 53,304,000
Effect of dilutive securities:        
Stock options, restricted stock, stock appreciation rights and employee stock purchase plan 741,000 254,000 472,000 258,000
Shares used in net income per common share - diluted 54,315,000 53,568,000 53,895,000 53,562,000
Net income per common share:        
Basic $ 0.61 $ 0.56 $ 1.11 $ 1.82
Diluted $ 0.60 $ 0.56 $ 1.10 $ 1.81