Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Jan. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,226,000		$ 4,155,000	$ 2,600,000
Goodwill impairment			3,000,000
Aggregate amortization expense	$ 401,000	$ 423,000
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