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Details of Basic and Diluted EPS (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net income $ 84,280 $ 63,306
Weighted average shares outstanding - basic 83,931 85,456
Dilutive effect of stock plans 2,221 1,768
Weighted average shares outstanding - diluted 86,152 87,224
Basic earnings per share $ 1.00 $ 0.74
Diluted earnings per share $ 0.98 $ 0.73
Anti-dilutive shares 0 309