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Subsequent Event - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended
Oct. 31, 2012
Oct. 31, 2012
Collateral [Member]
Dec. 19, 2012
Subsequent Event [Member]
Dec. 19, 2012
Subsequent Event [Member]
Payment of principal for first eight quarters [Member]
Dec. 19, 2012
Subsequent Event [Member]
Payment of principal for next twelve quarters [Member]
Dec. 19, 2012
Subsequent Event [Member]
Term Loan [Member]
Dec. 19, 2012
Subsequent Event [Member]
Revolving Multicurrency Credit Facility [Member]
Senior secured credit agreement     $ 1,000,000,000        
Revolving multicurrency credit facility             800,000,000
Term loan           200,000,000  
Credit facility expiring     December 2017        
Credit facility additional borrowing capacity     250,000,000        
Term loan quarterly repayment       $ 2,500,000 $ 5,000,000    
Leverage ratio, adjusted EBITDA 4.00 3.75          
Interest coverage ratio, adjusted EBITDA 3.00