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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Goodwill [Roll Forward]    
Balance at beginning of period $ 1,036,994 $ 1,036,994
Acquisitions and adjustments 0 0
Balance at end of period $ 1,036,994 $ 1,036,994