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Comprehensive income (loss) - Schedule of Components of Changes in Accumulated Other Comprehensive Income (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
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance (Restated)     $ 4,745  
Unrealized gain on cross-currency swap, net of tax $56 222 (585) (96) (76)
Foreign currency translation adjustment (741) (2,827) (3,449) (956)
Ending balance 1,200   1,200  
Foreign Currency Translation Adjustments [Member]
        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance (Restated)     4,614  
Unrealized gain on cross-currency swap, net of tax $56         
Foreign currency translation adjustment     (3,449)  
Ending balance 1,165   1,165  
Fair Value of Cross- Currency Swaps [Member]
        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance (Restated)     131  
Unrealized gain on cross-currency swap, net of tax $56     (96)  
Foreign currency translation adjustment         
Ending balance 35   35  
Accumulated Other Comprehensive Income (Loss) [Member]
        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance (Restated)     4,745  
Unrealized gain on cross-currency swap, net of tax $56     (96)  
Foreign currency translation adjustment     (3,449)  
Ending balance $ 1,200   $ 1,200