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Comprehensive income (loss) - Schedule of Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Foreign Currency Translation Adjustments [Member]
Mar. 31, 2013
Fair Value of Cross- Currency Swaps [Member]
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]          
Beginning balance $ 1,719 [1] $ 4,745 $ 4,614 $ 131 $ 4,745
Unrealized gain on cross-currency swap, net of tax       (318) (318)
Foreign currency translation adjustment     (2,708)   (2,708)
Ending balance $ 1,719 [1] $ 4,745 $ 1,906 $ (187) $ 1,719
[1] Unaudited