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Goodwill and Other Intangible Assets - Other Intangible Assets, Changes in Net Carrying Amount (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Gross Amount      
Other intangible assets, beginning   $ 956,800 $ 964,700
Intangible assets acquired, purchase accounting adjustment   0  
Intangible assets acquired during the period     1,000
Currency translation effect on foreign balances   900 (1,800)
Other intangible assets, ending   807,100 956,800
Finite-Lived Intangible Assets, Disposal of Intangible Assets   (41,700) (7,100)
Amortization of Intangible Assets, Adjustment for Disposal   41,700 7,100
Accumulated Amortization      
Other intangible assets, beginning   (126,500) (94,100)
Amortization expense   (36,100) (40,900)
Currency translation effect on foreign balances   200 1,400
Other intangible assets, ending   (120,700) $ (126,500)
Goodwill, Impairment Loss $ (108,900) $ 108,900