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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill impairment    $ 74.6us-gaap_GoodwillImpairmentLoss