Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Jan. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,155,000		$ 4,155,000		$ 4,155,000	$ 2,500,000
Goodwill impairment					3,000,000
Aggregate amortization expense	$ 378,000	$ 430,000	$ 779,000	$ 853,000
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			3 years
Equipment Leasing [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets					$ 600,000
Klein Associates Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill						1,662,000
Other intangible assets						$ 2,400,000