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Summary of Stock Option Activity (Detail) - Stock Option Awards - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Options outstanding, shares      
Beginning Balance 992 886 1,323
Granted 710 175 45
Exercised (21) (12) (112)
Forfeited/Expired (201) (57) (370)
Ending Balance 1,480 992 886
Exercisable as of December 31, 2018 701    
Expected to vest as of December 31, 2018 779    
Total 1,480    
Weighted Average Exercise Price Per Share      
Beginning Balance $ 145.28 $ 143.89 $ 129.04
Granted 130.27 169.04 189.62
Exercised 121.13 143.35 97.82
Forfeited/Expired 154.49 196.52 110.28
Ending Balance 137.16 $ 145.28 $ 143.89
Exercisable as of December 31, 2018 136.01    
Expected to vest as of December 31, 2018 138.20    
Total $ 137.16    
Aggregate Intrinsic Value      
Exercised $ 196 $ 541 $ 8,102
Exercisable as of December 31, 2018 3,317    
Expected to vest as of December 31, 2018 174    
Total $ 3,491    
Weighted Average Remaining Contractual Term (Years)      
Exercisable as of December 31, 2018 5 years 6 months    
Expected to vest as of December 31, 2018 9 years    
Total 7 years 3 months 18 days