Income Taxes - Summary of Tax Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 1,301	$ 1,153	$ 5,409
Additional Charged to Expenses		280	46
Additions Charged to Other Account
Deductions Charged to Expenses or Other Accounts	(58)	(132)	(4,302)
Balance at End of Period	$ 1,243	$ 1,301	$ 1,153