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Long-Term Compensation - Stock Option and Other Share Based Activity (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Options, Beginning balance 7,513,217
Number of Options, Exercised (755,264)
Number of Options, Forfeited/ Expired (322,925)
Number of Options, Ending balance 6,435,028
Weighted Average Exercise Price, Ending Balance $ 36.04
Options Exercisable, Number of Options Ending balance 6,290,114