Property and Equipment, Net - Schedule of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Jan. 31, 2013
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 19,753	$ 18,821
Less: accumulated depreciation	(13,829)	(12,645)
Property and equipment, net	5,924	6,176
Computer Software and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	16,740	15,718
Office Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	377	371
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,636	$ 2,732