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Stock-Based Compensation - Number and Weighted Average Exercise Price of Options Issued and Outstanding under all Stock Option Plans (Detail)
shares in Thousands
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options outstanding, beginning of period 6,953
Granted 270
Canceled (83)
Exercised (314)
Options outstanding, end of period 6,826
Options exercisable, end of period 4,003
Options available for grant, end of period 3,600
Average Exercise Price  
Options outstanding, beginning of period | $ / shares $ 36.26
Granted | $ / shares 86.93
Canceled | $ / shares 47.36
Exercised | $ / shares 28.24
Options outstanding, end of period | $ / shares 38.50
Options exercisable, end of period | $ / shares $ 26.79