Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$ 61,000	$ 61,000	$ 182,000	$ 182,000