Sales and Major Customers - Additional Information (Detail)	12 Months Ended
	Jan. 31, 2014 Person	Jan. 31, 2013 Person	Dec. 31, 2012 Person
Segment Reporting [Abstract]
Percentage change in total revenues by one customer	10.00%	10.00%	10.00%
Number of customers with revenue exceeding 10% of total Company revenue	1	1	1