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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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of the period     $ 1,761  
Unrealized gain on cross-currency swap, net of tax 253 (927) 177 374
Foreign currency translation adjustment 1,254 (5,787) (343) (2,163)
Balance at end of the period 1,595   1,595  
Foreign Currency Translation Adjustments [Member]
        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of the period     1,893  
Foreign currency translation adjustment     (343)  
Balance at end of the period 1,550   1,550  
Fair Value of Cross-Currency Swap [Member]
        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of the period     (132)  
Unrealized gain on cross-currency swap, net of tax     177  
Balance at end of the period 45   45  
Accumulated Other Comprehensive Income [Member]
        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of the period     1,761  
Unrealized gain on cross-currency swap, net of tax     177  
Foreign currency translation adjustment     (343)  
Balance at end of the period $ 1,595   $ 1,595