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Credit Agreement - Schedule of U.S. Credit Agreement (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Letter of credit collateralized of restricted cash $ 12.6 $ 7.4
Letters of credit sub limited 70.0  
Letter of credit [Member]
   
Line of Credit Facility [Line Items]    
Letters of credit sub limited $ 20.0