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Net Revenues - Schedule of contract cost assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Opening balance			$ 225,897
Closing balance	$ 240,378		240,378
Sales Incentive Programs
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Opening balance	31,559	$ 32,182	33,390	$ 35,366
Closing balance	31,058	30,047	31,058	30,047
Amortization	5,041	6,094	14,576	14,329
Process Transition Activities
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Opening balance	210,747	178,570	192,507	170,132
Closing balance	209,320	181,747	209,320	181,747
Amortization	$ 23,028	$ 17,935	$ 58,644	$ 50,397

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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+ References

No definition available.

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