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Derivative instruments - Schedule of Fair Values of Derivative Instruments (Detail) (Cross-currency swap [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Other long-term liabilities [Member]
Dec. 31, 2012
Other long-term assets [Member]
Derivatives, Fair Value [Line Items]    
Fair value: favorable (unfavorable) $ (523) $ 305