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Derivative financial instruments - Schedule of Aggregate Notional Principal Amounts of Outstanding Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Balance sheet exposure asset (liability)	$ (82,312)	$ (36,698)
United States Dollars (sell) Indian Rupees (buy)
Derivative [Line Items]
Notional principal amounts	2,470,754	2,413,000
Balance sheet exposure asset (liability)	(64,005)	(36,478)
United States Dollars (sell) Mexican Peso (buy)
Derivative [Line Items]
Notional principal amounts	66,000	71,000
Balance sheet exposure asset (liability)	1,081	(8,188)
United States Dollars (sell) Philippines Peso (buy)
Derivative [Line Items]
Notional principal amounts	181,800	161,400
Balance sheet exposure asset (liability)	(3,941)	(3,274)
Euro (sell) United States Dollars (buy)
Derivative [Line Items]
Notional principal amounts	339,202	219,706
Balance sheet exposure asset (liability)	(12,963)	10,282
Singapore Dollar (buy) United States Dollars (sell)
Derivative [Line Items]
Notional principal amounts	12,000	12,000
Balance sheet exposure asset (liability)	588	(407)
Euro (sell) Romanian Leu (buy)
Derivative [Line Items]
Notional principal amounts	28,166	67,144
Balance sheet exposure asset (liability)	240	(156)
Japanese Yen (sell) Chinese Renminbi (buy)
Derivative [Line Items]
Notional principal amounts	45,570	34,507
Balance sheet exposure asset (liability)	981	3,402
United States Dollars (sell) Chinese Renminbi (buy)
Derivative [Line Items]
Notional principal amounts	79,500	46,800
Balance sheet exposure asset (liability)	(947)	(1,883)
Pound Sterling (sell) United States Dollars (buy)
Derivative [Line Items]
Notional principal amounts	71,191	15,507
Balance sheet exposure asset (liability)	(198)	463
United States Dollars (sell) Hungarian Font (buy)
Derivative [Line Items]
Notional principal amounts	41,250	21,000
Balance sheet exposure asset (liability)	2,630	(1,611)
Australian Dollars (sell) Indian Rupees (buy)
Derivative [Line Items]
Notional principal amounts	145,431	109,490
Balance sheet exposure asset (liability)	(5,212)	3,556
United States Dollars (sell) Polish Zloty (buy)
Derivative [Line Items]
Notional principal amounts	21,000	39,000
Balance sheet exposure asset (liability)	2,199	(1,190)
Japanese Yen (sell) United States Dollars (buy)
Derivative [Line Items]
Notional principal amounts	7,000	7,000
Balance sheet exposure asset (liability)	221	366
Israeli Shekel (buy) United States Dollars (sell)
Derivative [Line Items]
Notional principal amounts	30,000	20,000
Balance sheet exposure asset (liability)	2,690	454
South African Rand (sell) United States Dollars (buy)
Derivative [Line Items]
Notional principal amounts	22,000	32,000
Balance sheet exposure asset (liability)	(1,633)	1,725
United States Dollars (sell) Brazilian Real (buy)
Derivative [Line Items]
Notional principal amounts	4,000	4,000
Balance sheet exposure asset (liability)	760	(314)
United States Dollars (sell) Costa Rica Colon (buy)
Derivative [Line Items]
Notional principal amounts	15,000	13,000
Balance sheet exposure asset (liability)	316	231
United States Dollars (sell) Canadian Dollar (buy)
Derivative [Line Items]
Notional principal amounts	9,000	9,000
Balance sheet exposure asset (liability)	(168)	(352)
United States Dollars (sell) Malaysian Ringgit (buy)
Derivative [Line Items]
Notional principal amounts	17,750	5,000
Balance sheet exposure asset (liability)	239	(169)
Interest rate swaps (floating to fixed)
Derivative [Line Items]
Notional principal amounts	225,000	234,375
Balance sheet exposure asset (liability)	$ (5,190)	$ (3,155)

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- Definition

Fair value of credit risk derivative asset after deduction of credit risk derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4K
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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