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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2013
Swap
Sep. 30, 2010
Swap
Jun. 30, 2013
Derivatives, Fair Value [Line Items]      
Number of interest rate swap agreements 3 2  
Loss incurred on termination of interest rate swaps     $ 2.7
Derivative losses included in AOCI     $ 1.5
Cross currency swap [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative instrument maturity period (years)     10 years
Forward currency contracts [Member]
     
Derivatives, Fair Value [Line Items]      
Number of multiple forward currency contracts matured     4
Remaining maturity of outstanding forward currency contracts     Less than one year