Leases - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) Property
Leases [Line Items]
Lessee, operating leases, option to extend	Leases with renewal options allow the Company to extend the lease term typically between 1 to 10 years.
Lessee, operating lease, existence of option to extend [true false]	true
Lessee, operating lease, option to terminate	real estate lease agreements include Company options to either extend and/or terminate the lease
Lessee, operating lease, existence of option to terminate [true false]	true
Additional right-of-use assets	$ 151.5
Right-of-use assets related to new leases commenced and existing leases extended during period	$ 133.6
Weighted average discount rate	3.00%	3.80%
Weighted average remaining lease term	15 years	4 years 10 months 24 days
Operating cash flows used for operating leases	$ 13.0	$ 23.4
Tenant improvement allowance receipts	10.3
Gain loss on sale lease back		6.8
Proceeds received on sale lease back transactions		$ 41.2
2021 lease payment	21.6
Tenant improvement allowance	$ 6.7
Boulder, Colorado [Member]
Leases [Line Items]
Number of properties sold as part of sale and leaseback transactions | Property		2
Portland, Oregon [Member]
Leases [Line Items]
Number of properties sold as part of sale and leaseback transactions | Property		3
Minimum [Member]
Leases [Line Items]
Operating leases, options to extend leases term	1 year
Maximum [Member]
Leases [Line Items]
Operating leases, options to extend leases term	10 years