Leases - Additional Information (Detail) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Lease	Sep. 30, 2020 USD ($)
Lessee Lease Description [Line Items]
Operating leases expiration date				2032
Number of subleases | Lease				1
Sublease income | $	[1]	$ 263	$ 494	$ 1,097	$ 1,845
Minimum [Member]
Lessee Lease Description [Line Items]
Lease term range, years		5 years		5 years
Number of renewal options for extended terms		1 year		1 year
Operating sublease term				20 months
Maximum [Member]
Lessee Lease Description [Line Items]
Lease term range, years		10 years		10 years
Number of renewal options for extended terms		4 years		4 years

[1] Lease expense and sublease income represent the amount recorded within our unaudited condensed consolidated statements of income. Variable lease amounts represent expenses recognized as incurred which are not included in the lease liability. Fixed lease expenses and sublease income are recorded on a straight-line basis over the lease term and therefore are not necessarily representative of cash payments during the same period.