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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, 2017 | Jan. 31, 2016 | Jan. 31, 2015
--- | --- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | $ 13,516 | $ 13,474 |
Cost of seismic equipment lease pool and property and equipment | 232,517 | 244,397 |
Less accumulated depreciation | (188,679) | (170,881) |
Seismic equipment lease pool and property and equipment, net | 43,838 | 73,516 | $ 100,087
Recording Channels [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | 126,081 | 127,202 |
Other Peripheral Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | 92,920 | 103,721 |
Seismic Equipment Lease Pool [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | 219,001 | 230,923 |
Land and Buildings [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | 3,379 | 3,375 |
Furniture and Fixtures [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | 9,462 | 9,405 |
Autos and Trucks [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost of property and equipment | $ 675 | $ 694 |

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