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Derivative Financial Instruments - Aggregate Notional Principal Amounts of Outstanding Derivative Financial Instruments with Related Balance Sheet Exposure (Detail) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Derivative financial instrument, balance sheet exposure asset (liability) [1] $ (85,651,000) $ (2,930,000)
United States Dollars (sell) Indian Rupees (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 1,202,000,000 1,305,000,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] (69,021,000) (5,740,000)
United States Dollars (sell) Philippines Peso (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 56,700,000 66,600,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] (137,000) 462,000
Euro (sell) United States Dollars (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 158,283,000 122,337,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] 6,536,000 4,135,000
Singapore Dollars (buy) United States Dollars (sell)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 10,017,000 10,017,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] (511,000) 38,000
Euro (sell) Romanian Leu (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 29,746,000 26,918,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] (356,000) (314,000)
Japanese Yen (sell) Chinese Renminbi (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 22,029,000 29,350,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] (452,000) (258,000)
Pound Sterling (sell) United States Dollars (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 6,822,000 9,089,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] 699,000 383,000
Australian Dollars (sell) United States Dollars (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 2,300,000 35,972,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] 253,000 1,924,000
United States Dollars (sell) Hungarian Font (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 19,500,000 20,500,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] (1,751,000) 162,000
Hungarian Font (Sell) Euro (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 9,364,000 9,534,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] 397,000 (157,000)
Australian Dollars (sell) Indian Rupees (buy)    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 29,750,000  
Derivative financial instrument, balance sheet exposure asset (liability) [1] (90,000)  
Interest Rate Swap Floating To Fixed [Member]    
Derivative [Line Items]    
Derivative instrument notional principal amount [2] 495,149,000 477,604,000
Derivative financial instrument, balance sheet exposure asset (liability) [1] $ (21,218,000) $ (3,565,000)
[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, foreign exchange, interest rate or market risks. However, the amounts exchanged are based on the notional amounts and other provisions of the underlying derivative financial instrument agreements. Notional amounts are denominated in U.S. dollars.