Equity Participation Right - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	1 Months Ended	12 Months Ended
	Jul. 03, 2012	Jul. 31, 2009	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Discount for equity instrument		15.00%
Derivative instrument fair value	$ 0
Gain recorded in other income (expense)	276			(276)	(276)
Maximum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Related party investment right		$ 10,000