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Comprehensive income (loss) - Schedule of Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statement Of Stockholders Equity [Abstract]        
Unrealized gain on derivative instrument, taxes $ 275 $ 275 $ 275 $ 275