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Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Options outstanding, shares  
Beginning Balance | shares 1,323
Granted | shares 0
Exercised | shares (102)
Forfeited/Expired | shares (325)
Ending Balance | shares 896
Exercisable as of March 31, 2016 | shares 169
Expected to vest as of March 31, 2016 | shares 727
Total | shares 896
Weighted Average Exercise Price Per Share  
Beginning Balance | $ / shares $ 129.04
Granted | $ / shares 0.00
Exercised | $ / shares 93.85
Forfeited/Expired | $ / shares 98.39
Ending Balance | $ / shares 144.13
Exercisable as of March 31, 2016 | $ / shares 132.20
Expected to vest as of March 31, 2016 | $ / shares 146.90
Total | $ / shares $ 144.13
Aggregate Intrinsic Value  
Exercised | $ $ 7,550
Exercisable as of March 31, 2016 | $ 8,019
Expected to vest as of March 31, 2016 | $ 26,673
Total | $ $ 34,692
Weighted Average Remaining Contractual Term (Years)  
Exercisable as of March 31, 2016 8 years 3 months 18 days
Expected to vest as of March 31, 2016 8 years 6 months
Total 8 years 6 months