Leases - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2021 Lease
Leases [Abstract]
Operating lease, option to extend	Certain of these leases offer the option to extend the lease term and such extensions are included in the calculation of the lease liabilities to the extent the options are reasonably assured of being exercised.
Operating lease, existence of to extend	true
Number of operating leases assumed	5