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Derivative Instruments and Hedging Activities - Balance Sheet Location and Fair Values of Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Assets    
Total assets $ 32   
Liabilities    
Total liabilities 44 353
Designated as hedging instrument [Member] | Prepaid expenses and other [Member]
   
Assets    
Derivative assets 7   
Designated as hedging instrument [Member] | Accrued liabilities [Member]
   
Liabilities    
Derivative Liabilities    197
Not designated as hedging instrument [Member] | Prepaid expenses and other [Member]
   
Assets    
Derivative assets 25   
Not designated as hedging instrument [Member] | Accrued liabilities [Member]
   
Liabilities    
Derivative Liabilities $ 44 $ 156