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Financing Arrangements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Schedule Of Debt [Line Items]    
Outstanding letters of credit $ 4.2  
Letter of credit expiration, year 2013  
Unused and available borrowings under bank revolving line of credit $ 45.8 $ 46.3