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Comprehensive income (loss) - Schedule of Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Stockholders Equity [Abstract]        
Net income (loss) $ (2,317) $ 7,254 $ 2,183 $ 16,661
Other comprehensive income (loss):        
Unrealized gain (loss) on cross-currency swap, net of tax $56 222 (585) (96) (76)
Foreign currency translation adjustment (741) (2,827) (3,449) (956)
Total comprehensive income (loss) $ (2,836) $ 3,842 $ (1,362) $ 15,629