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Effects of Foreign Currency Forward Contracts Designated as Cash Flow Hedges (Detail)

v2.4.0.8
Effects of Foreign Currency Forward Contracts Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging, Foreign Exchange Forward, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash Flow Hedging | Foreign Exchange Forward
             
Derivative Instruments, Gain (Loss) [Line Items]              
Gain (loss) recognized in other comprehensive loss - effective portion   $ 2,609 $ (7,886) $ 4,332 $ 11,685     
Gain (loss) recognized in other income (expense)- ineffective portion     66       (33,061)
Effect of derivative on consolidated financial statements         11,685    (33,061)
Amount reclassified from accumulated comprehensive income (loss) into depreciation and amortization expense $ (32)   $ (52)