Quarterly report pursuant to Section 13 or 15(d)

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

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Effects of Foreign Currency Collar Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging, Foreign Currency Collar, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Cash Flow Hedging | Foreign Currency Collar
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain recognized in other comprehensive income - effective portion $ 4,518 $ 5,156 $ 2,243 $ 5,156