Stockholders' Equity - Stock Option Activity (Detail) (USD $)	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Equity [Abstract]
Shares, Outstanding at beginning of period	1,502,176	1,917,448	2,125,371
Shares, Granted	500,000	12,500	892,500
Shares, Exercised	0	(118,528)	(304,550)
Shares, Forfeited/expired/cancelled	(375,755)	(309,244)	(795,873)
Shares, Outstanding at end of period	1,626,421	1,502,176	1,917,448
Shares, Options exercisable at end of period	1,108,115	1,440,521	937,444
Weighted average exercise price, Outstanding at beginning of period	$ 9.77	$ 10.35	$ 11.83
Weighted average exercise price, Granted	$ 7.23	$ 10.10	$ 8.21
Weighted average exercise price, Exercised		$ 9.10	$ 7.19
Weighted average exercise price, Forfeited/expired/cancelled	$ 15.06	$ 13.78	$ 13.11
Weighted average exercise price, Outstanding at end of period	$ 7.77	$ 9.77	$ 10.35
Weighted average exercise price, Options exercisable at end of period	$ 8.02	$ 9.90	$ 12.78
Weighted average exercise price, Weighted average remaining contractual term (in years)	4 years 8 months 19 days	3 years 11 months 5 days	1 year 10 months 10 days