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Goodwill and Intangible Assets - Schedule of intangible assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 741,983	$ 750,907
Accumulated amortization & Impairment	570,975	514,175
Net	171,008	236,732
Customer-related intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	474,041	478,189
Accumulated amortization & Impairment	385,494	359,652
Net	88,547	118,537
Marketing-related intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	96,395	96,561
Accumulated amortization & Impairment	73,113	61,154
Net	23,282	35,407
Technology-related intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	171,547	152,293
Accumulated amortization & Impairment	112,368	90,866
Net	59,179	61,427
Intangible assets under development
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	0	23,864
Accumulated amortization & Impairment	0	2,503
Net	$ 0	$ 21,361

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
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