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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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