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Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Options outstanding, at December 31, 2014, Shares | shares 4,340
Options granted, Shares | shares 185
Options exercised, Shares | shares (763)
Options forfeited, Shares | shares (270)
Options outstanding, at December 31, 2015, Shares | shares 3,492
Options exercisable, at December 31, 2015, Shares | shares 2,110
Options outstanding, at December 31, 2014, Weighted-Average Exercise Price | $ / shares $ 38.03
Options granted, Weighted-Average Exercise Price | $ / shares 36.82
Options exercised, Weighted-Average Exercise Price | $ / shares 29.92
Options forfeited, Weighted-Average Exercise Price | $ / shares 48.90
Options outstanding, at December 31, 2015, Weighted-Average Exercise Price | $ / shares 38.89
Options exercisable, at December 31, 2015, Weighted-Average Exercise Price | $ / shares $ 41.37
Options outstanding, at December 31, 2015, Weighted-Average Remaining Contractual Term, in years 5 years 3 months 18 days
Options exercisable, at December 31, 2015, Weighted-Average Remaining Contractual Term, in years 4 years
Options outstanding, at December 31, 2015, Aggregate Intrinsic Value | $ $ 4,745
Options exercisable, at December 31, 2015, Aggregate Intrinsic Value | $ $ 2,879