Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 3,997	$ 4,155	$ 5,594
Aggregate amortization expense	$ 1,500	$ 1,700	$ 1,400
Klein Associates Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill				$ 1,662
Other intangible assets				$ 2,400