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Leases - Additional Information (Detail) $ in Millions | 12 Months Ended
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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 |

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- Definition Number of properties sold as part of sale and leaseback transactions. + References No definition available. + Details
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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Net cash outflow or inflow from monetary allowance granted by the landlord to a tenant to entice tenant to move into landlords building which will enable the tenant to prepare the leased premises for tenants occupancy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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