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Comprehensive income (loss) - Schedule of Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Comprehensive Income Loss [Line Items]        
Net income (loss) $ 7,560 $ 12,378 $ 30,781 $ (13,465)
Other comprehensive income (loss):        
Unrealized gain (loss) on cross-currency swap, net of tax 253 (927) 177 374
Foreign currency translation adjustment 1,254 (5,787) (343) (2,163)
Total comprehensive income (loss) $ 9,067 $ 5,664 $ 30,615 $ (15,254)