Property and Equipment - Schedule of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 21,706	$ 18,821
Less accumulated depreciation	(14,350)	(12,645)
Property and equipment, net	7,356	6,176	3,364
Computer Software and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	18,635	15,718
Office Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	444	371
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,627	$ 2,732