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Amounts Recognized for Share-Based Compensation (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total cost of share-based compensation plans $ 15,900,000 $ 13,900,000
Amounts capitalized in inventory and fixed assets (600,000) (400,000)
Amounts recognized in income for amounts previously capitalized in inventory and fixed assets 500,000 400,000
Amounts charged against income $ 15,800,000 $ 13,900,000