XML 83 R62.htm IDEA: XBRL DOCUMENT v3.4.0.3
Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator:    
Net income $ 17,563 $ 33,786
Denominator:    
Shares used in net income per common share - basic 53,235,000 53,214,000
Effect of dilutive securities:    
Stock options, restricted stock and employee stock purchase plan 328,000 315,000
Shares used in net income per common share - diluted 53,563,000 53,529,000
Net income per common share:    
Basic $ 0.33 $ 0.63
Diluted $ 0.33 $ 0.63