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Property Plant and Equipment - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Property Plant And Equipment Useful Life And Values [Abstract] |  |  |  |
Cash purchase of office building | $ 1,955,000 |  |  |
Depreciation expense |  | 549,000 | 522,000 | 455,000
Costs of maintenance and repairs |  | $ 250,000 | $ 325,000 | $ 295,000

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