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Aggregate Notional Principal Amounts of Outstanding Derivative Financial Instruments with Related Balance Sheet Exposure (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivative [Line Items]    
Derivative financial instrument, balance sheet exposure asset (liability) [1] $ (25,643) $ (29,240)
United States Dollars (sell) Indian Rupees (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 1,122,400 1,139,400
Derivative financial instrument, balance sheet exposure asset (liability) [1] (31,954) (48,197)
United States Dollars (sell) Mexican Peso (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 6,570 8,520
Derivative financial instrument, balance sheet exposure asset (liability) [1] (824) (1,163)
United States Dollars (sell) Philippines Peso (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 53,075 58,500
Derivative financial instrument, balance sheet exposure asset (liability) [1] 224 (1,387)
Euro (sell) United States Dollars (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 140,385 146,719
Derivative financial instrument, balance sheet exposure asset (liability) [1] 3,787 9,109
Euro (sell) Romanian Leu (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 31,516 39,027
Derivative financial instrument, balance sheet exposure asset (liability) [1] 1,036 567
Japanese Yen (sell) Chinese Renminbi (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 61,317 62,740
Derivative financial instrument, balance sheet exposure asset (liability) [1] (4,765) (1,379)
Pound Sterling (sell) United States Dollars (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 105,771 118,438
Derivative financial instrument, balance sheet exposure asset (liability) [1] 9,178 7,496
Australian Dollars (sell) United States Dollars (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 99,000 106,544
Derivative financial instrument, balance sheet exposure asset (liability) [1] (399) $ 5,714
Interest Rate Swap Floating To Fixed [Member]    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 200,000  
Derivative financial instrument, balance sheet exposure asset (liability) [1] $ (1,926)  
[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 instrument agreements.