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Financial Instruments - Summary of Outstanding Interest Rate Swap (Detail) (Interest Rate Swap [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Notional Amount $ 40,000 $ 40,000
Other Current and Non-Current Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Notional Amount 25,000 40,000
Fair Value $ (214) $ (452)