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Aggregate Notional Principal Amounts of Outstanding Derivative Financial Instruments with Related Balance Sheet Exposure (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative financial instrument, balance sheet exposure asset (liability) $ (270,691) [1] $ (163,431) [1]
United States Dollars (sell) Indian Rupees (buy)
    
Derivative [Line Items]    
Derivative instrument notional principal amount 1,472,000 [2] 1,706,000 [2]
Derivative financial instrument, balance sheet exposure asset (liability) (269,392) [1] (160,432) [1]
United States Dollars (sell) Mexican Peso (buy)
    
Derivative [Line Items]    
Derivative instrument notional principal amount 12,300 [2] 8,400 [2]
Derivative financial instrument, balance sheet exposure asset (liability) (422) [1] 306 [1]
United States Dollars (sell) Philippines Peso (buy)
    
Derivative [Line Items]    
Derivative instrument notional principal amount 56,850 [2] 58,800 [2]
Derivative financial instrument, balance sheet exposure asset (liability) (1,723) [1] 2,237 [1]
Euro (sell) United States Dollars (buy)
    
Derivative [Line Items]    
Derivative instrument notional principal amount 45,134 [2] 79,501 [2]
Derivative financial instrument, balance sheet exposure asset (liability) (1,836) [1] (420) [1]
Euro (sell) Hungarian Forints (buy)
    
Derivative [Line Items]    
Derivative instrument notional principal amount 5,598 [2] 9,968 [2]
Derivative financial instrument, balance sheet exposure asset (liability) 51 [1] (10) [1]
Euro (Sell) Romanian Leu (Buy)
    
Derivative [Line Items]    
Derivative instrument notional principal amount 63,689 [2] 64,870 [2]
Derivative financial instrument, balance sheet exposure asset (liability) 1,433 [1] (645) [1]
Japanese Yen (sell) Chinese Renminbi (buy)
    
Derivative [Line Items]    
Derivative instrument notional principal amount 29,573 [2] 26,214 [2]
Derivative financial instrument, balance sheet exposure asset (liability) 2,046 [1] 1,451 [1]
Pound Sterling (sell) United States Dollars (buy)
    
Derivative [Line Items]    
Derivative instrument notional principal amount 74,149 [2] 92,165 [2]
Derivative financial instrument, balance sheet exposure asset (liability) (2,791) [1] (2,494) [1]
Australian Dollars (sell) United States Dollars (buy)
    
Derivative [Line Items]    
Derivative instrument notional principal amount 59,450 [2] 60,626 [2]
Derivative financial instrument, balance sheet exposure asset (liability) $ 1,943 [1] $ (3,424) [1]
[1] Balance sheet exposure is denominated in U.S. Dollars and denotes the mark-to-market impact of the derivative financial instruments on the reporting date.
[2] Notional amounts are key elements of derivative financial instrument agreements but do not represent the amount exchanged by counterparties and do not measure the Company's exposure to credit or market risks. However, the amounts exchanged are based on the notional amounts and other provisions of the underlying derivative financial instruments agreements.