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Comprehensive income (loss) - Schedule of Components of Changes in Accumulated Other Comprehensive Income (Parenthetical) (Detail) (Accumulated Other Comprehensive Income [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Accumulated Other Comprehensive Income [Member]
 
Accumulated Other Comprehensive Income Loss [Line Items]  
Unrealized gain on derivative instrument, taxes $ 102