Goodwill and Intangibles - Additional Information (Detail) - USD ($)	3 Months Ended			12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill acquisitions							$ 33,250,000	$ 18,851,000
Goodwill	$ 18,851,000	$ 18,851,000		$ 18,851,000	$ 18,851,000				$ 0
Goodwill impairment charge			$ 33,827,000	0	$ 0	$ 33,827,000
Impairment of indefinite-lived intangible assets	0	$ 0
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2021	19,727,000			19,727,000
2022	17,938,000			17,938,000
2023	16,737,000			16,737,000
2024	15,463,000			15,463,000
2025	$ 2,534,000			$ 2,534,000