Quarterly report pursuant to Section 13 or 15(d)

Goodwill - Summary of Goodwill (Detail)

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Goodwill - Summary of Goodwill (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]          
Beginning balance $ 1,298,324 $ 121,233 $ 121,754 $ 128,750 $ 121,137
Additions from acquisitions 472 7,517 0 1,298,796 617
Ending balance $ 1,298,796 $ 128,750 $ 121,754 $ 1,298,796 $ 121,754