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Derivative instruments - Schedule of Gain (Loss) Recognized on Derivative Instruments (Detail) (Cross-currency swap [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cross-currency swap [Member]
   
Derivative Instruments [Line Items]    
Cross-currency swap unrealized gain (loss) recorded in other comprehensive income (loss), net of taxes $ (318) $ 509