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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets Sold under Agreements to Repurchase [Line Items]      
Gain/Loss on remeasurement of contingent consideration $ 13.6 $ 5.2 $ 10.0
Accretion expense $ 2.7 $ 2.2 $ 3.5
6 3/4 % Senior Notes Due 2020
     
Assets Sold under Agreements to Repurchase [Line Items]      
Interest percentage 6.75%    
Debt maturity period 2020    
6.0% Senior Notes Due 2022
     
Assets Sold under Agreements to Repurchase [Line Items]      
Interest percentage 6.00%    
Debt maturity period 2022