Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Jan. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 5,552,000		$ 5,552,000		$ 5,594,000
Goodwill impairment			0
Aggregate amortization expense	$ 413,000	$ 458,000	$ 1,300,000	$ 982,000
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets			15 years
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets			8 years