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Property and Equipment - Schedule of Cost Basis and Estimated Useful Lives of Property and Equipment (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |
Computer hardware and software | [1] | $ 40,587 | $ 27,660
Leasehold improvements | [1] | 56,095 | 58,294
Furniture, fixtures and equipment | [1] | 23,071 | 23,145
Building and improvements | [1] | 8,485 | 8,485
Library materials | [1] | 24 | 171
Vehicles | [1] | 56 | 56
Construction in progress | [1] | 823 | 1,128
Property plant and equipment, Total | [1] | 129,141 | 118,939
Less-accumulated depreciation | [1] | (101,380) | (92,933)
Total property and equipment, net | [1] | $ 27,761 | $ 26,006
Leasehold Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful life (in years) | [1] | Shorter of Life of Lease or Useful Life |
Computer Hardware and Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful life (in years) | [1] | 3 years |
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful life (in years) | [1] | 5 years |
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful life (in years) | [1] | 10 years |
Building and Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful life (in years) |  | 15 years |
Building and Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful life (in years) |  | 35 years |
Library Materials [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful life (in years) | [1] | 10 years |
Vehicles [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment, estimated useful life (in years) | [1] | 5 years |
[1] | Property and equipment which were fully depreciated and no longer in use by the Company were retired during the years ended December 31, 2020 and 2019; therefore, both the cost of the asset and the related accumulated depreciation balances were reduced to zero for these assets.

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- Definition Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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