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Balance Sheet - Continuing Operations - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands | Jul. 31, 2021 | Jan. 31, 2021
--- | --- | ---
Property and equipment: |  |
Property and equipment | $ 18,969 | $ 20,564
Accumulated depreciation and amortization | (14,529) | (15,813)
Total property and equipment, net | 4,440 | 4,751
Marine seismic service equipment |  |
Property and equipment: |  |
Property and equipment | 4,157 | 5,969
Land and buildings |  |
Property and equipment: |  |
Property and equipment | 4,422 | 4,354
Furniture and fixtures |  |
Property and equipment: |  |
Property and equipment | 9,899 | 9,750
Autos and trucks |  |
Property and equipment: |  |
Property and equipment | $ 491 | $ 491

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