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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 213,601,000 $ 97,866,000 $ 88,420,000
Impairment of goodwill 0 0 0
Amortization expense 11,600,000 $ 7,500,000 $ 4,600,000
Capitalized internal-use software costs $ 5,400,000