Segment Reporting - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Schedule Of Sales Revenue By Business Segment [Line Items]
Revenues	$ 14,963	$ 22,906	$ 19,545	$ 25,732	$ 23,647	$ 20,275	$ 20,895	$ 27,291	$ 83,146	$ 92,108	$ 104,685
Reduction in capital expenditures and fixed assets									192	32	349
Intersegment Sales Elimination [Member]
Schedule Of Sales Revenue By Business Segment [Line Items]
Revenues									$ 489	$ 166	$ 1,041