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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2013
swap
Jun. 30, 2014
Forward currency contracts [Member]
contract
Jun. 30, 2014
Derivatives in Cash Flow Hedging Relationships [Member]
Cross currency swap [Member]
Derivatives, Fair Value [Line Items]          
Derivative instrument maturity period (years)         10 years
Number of multiple forward currency contracts matured       3  
Number of interest rate swap agreements     3    
Loss incurred on termination of interest rate swaps   $ 2.7      
Derivative losses included in AOCI $ 2.3