Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Additional Information (Detail)

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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Goodwill and Intangible Assets Disclosure [Line Items]    
Amortization expense related to purchased intangible assets $ 30.2 $ 22.4