Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Income Tax Disclosure [Abstract]
Effective income tax rate	19.90%	57.70%	39.10%	33.20%
(Provision) benefit for income taxes	$ (128)	$ (217)	$ 528	$ (549)
Income tax examination, description			With limited exceptions, the Company is no longer subject to federal, state, local or foreign examinations for years prior to January 31, 2009. However, carryforward attributes that were generated prior to January 31, 2010 may still be adjusted upon examination by state or local tax authorities if they either have been or will be used in a future period.
Threshold percentage for change in ownership			50.00%
Period of change in ownership			3 years

19.90%

57.70%

39.10%

33.20%

With limited exceptions, the Company is no longer subject to federal, state, local or foreign examinations for years prior to January 31, 2009. However, carryforward attributes that were generated prior to January 31, 2010 may still be adjusted upon examination by state or local tax authorities if they either have been or will be used in a future period.

Period of change in ownership

3 years