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Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock options outstanding at December 31, 2015, Shares | shares 3,349
Stock options granted, Shares | shares 119
Stock options exercised, Shares | shares (816)
Stock options forfeited, Shares | shares (234)
Stock options outstanding at December 31, 2016, Shares | shares 2,418
Stock options exercisable at December 31, 2016, Shares | shares 1,593
Stock options outstanding at December 31, 2015, Weighted Average Exercise Price | $ / shares $ 39.01
Stock options granted, Weighted Average Exercise Price | $ / shares 34.33
Stock options exercised, Weighted Average Exercise Price | $ / shares 33.30
Stock options forfeited, Weighted Average Exercise Price | $ / shares 38.17
Stock options outstanding at December 31, 2016, Weighted Average Exercise Price | $ / shares 40.79
Stock options exercisable at December 31, 2016, Weighted Average Exercise Price | $ / shares $ 43.95
Stock options outstanding at December 31, 2016, Weighted Average Remaining Contractual Term (in Years) 4 years 9 months 18 days
Stock options exercisable at December 31, 2016, Weighted Average Remaining Contractual Term (in Years) 3 years 9 months 18 days
Stock options outstanding at December 31, 2016, Aggregate Intrinsic Value | $ $ 16,876
Stock options exercisable at December 31, 2016, Aggregate Intrinsic Value | $ $ 8,290