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Goodwill and Identified Intangible Assets - Summary of Changes to Carrying Value of Goodwill (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Goodwill, beginning $ 385,784
Goodwill acquired through the Mergers (1) 461,129
Purchase price adjustment related to the Mergers (2) 116
Goodwill, ending $ 847,029