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Summary of Stock Option Activity (Detail) - Employee Stock Option
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Shares  
Outstanding at December 31, 2014 2,816
Granted 728
Exercised (190)
Forfeited and expired (528)
Outstanding at Sept. 30, 2015 2,826
Expected to vest at Sept. 30, 2015 1,321
Exercisable at Sept. 30, 2015 1,448
Weighted-Average Exercise Price  
Outstanding at December 31, 2014 | $ / shares $ 29.51
Granted | $ / shares 23.42
Exercised | $ / shares 19.53
Forfeited and expired | $ / shares 33.91
Outstanding at Sept. 30, 2015 | $ / shares 27.79
Expected to vest at Sept. 30, 2015 | $ / shares 26.34
Exercisable at Sept. 30, 2015 | $ / shares $ 29.25
Weighted-Average Remaining Contractual Term (years)  
Outstanding at Sept. 30, 2015 3 years
Expected to vest at Sept. 30, 2015 4 years 4 months 28 days
Exercisable at Sept. 30, 2015 1 year 7 months 13 days
Aggregate Intrinsic Value  
Outstanding at Sept. 30, 2015 | $ $ 0.0
Expected to vest at Sept. 30, 2015 | $ 0.0
Exercisable at Sept. 30, 2015 | $ $ 0.0