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Seismic Equipment Lease Pool and Property and Equipment - Schedule of Seismic Equipment Lease Pool and Property and Equipment (Detail) - USD ($) $ in Thousands | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
--- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | $ 14,324 | $ 13,516 |
Cost of seismic equipment lease pool and property and equipment | 188,598 | 232,517 |
Less accumulated depreciation | (165,698) | (188,679) |
Net book value of seismic equipment lease pool and property and equipment | 22,900 | 43,838 | $ 73,516
Recording channels |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | 89,397 | 126,081 |
Other peripheral equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | 84,877 | 92,920 |
Cost of seismic equipment lease pool |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | 174,274 | 219,001 |
Land and buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | 3,380 | 3,379 |
Furniture and fixtures |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | 10,222 | 9,462 |
Autos and trucks |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | $ 722 | $ 675 |

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