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Goodwill and Intangible Assets - Schedule of changes in goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]      
Gross carrying amount   $ 2,768,696 $ 2,758,367
Accumulated impairment charge   (652,000) (652,000)
Opening balance $ 2,116,696 2,106,367  
Acquisitions 43,393 7,351  
Foreign exchange translation effects 3,250 852  
Foreign exchange translation effects   2,126  
Closing balance 2,163,339 2,116,696  
Sales [Member]      
Goodwill [Line Items]      
Gross carrying amount   2,090,340 2,085,684
Accumulated impairment charge   (652,000) (652,000)
Opening balance 1,438,340 1,433,684  
Acquisitions 20,788 2,948  
Foreign exchange translation effects 3,250 (418)  
Foreign exchange translation effects   2,126  
Closing balance 1,462,378 1,438,340  
Marketing [Member]      
Goodwill [Line Items]      
Gross carrying amount   678,356 $ 672,683
Opening balance 678,356 672,683  
Acquisitions 22,605 4,403  
Foreign exchange translation effects   1,270  
Closing balance $ 700,961 $ 678,356