XML 27 R47.htm IDEA: XBRL DOCUMENT v2.4.0.8
Derivative instruments - Schedule of Gain (Loss) Recognized on Derivative Instruments (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
Derivative Instruments [Line Items]        
Cross-currency swap unrealized gain (loss) recorded in other comprehensive income (loss), net of taxes $ 222 $ (585) $ (96) $ (76)
Cross-currency swap [Member]
       
Derivative Instruments [Line Items]        
Cross-currency swap unrealized gain (loss) recorded in other comprehensive income (loss), net of taxes $ 222 $ (585) $ (96) $ (76)