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Leases - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Jan. 31, 2014
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Jan. 31, 2013
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Jan. 31, 2012
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Foreign Country [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Office rental expense | $ 1,387 | $ 1,528 | $ 1,199 |
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Seismic Equipment Lease Pool [Member] | Domestic Tax Authority [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Lease expense incurred by the Company | $ 621 | $ 1,798 | $ 1,634 |