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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, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |
Computer hardware and software | [1] | $ 45,482 | $ 40,587
Leasehold improvements | [1] | 60,520 | 56,095
Furniture, fixtures and equipment | [1] | 23,633 | 23,071
Building and improvements | [1] | 9,163 | 8,485
Library materials | [1] | 24 | 24
Vehicles | [1] | 55 | 56
Construction in progress | [1] | 3,189 | 823
Property plant and equipment, Total | [1] | 142,066 | 129,141
Less-accumulated depreciation | [1] | (113,711) | (101,380)
Total property and equipment, net | [1] | $ 28,355 | $ 27,761
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, 2021 and 2020; therefore, both the cost of the asset and the related accumulated depreciation balances were reduced to zero for these assets.

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