Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 12,548	$ 8,057	$ 8,663	$ 11,731	$ 11,442	$ 15,681	$ 7,554	$ 17,142	$ 40,999	$ 51,819	$ 83,146
Interest expense, net									(643)	(725)	(673)
Operating (loss) income									(31,290)	(26,760)	(6,745)
Capital expenditures									283	2,509	19,900
Depreciation and amortization expense									28,275	32,111	36,986
Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating (loss) income									(3,001)	(3,702)	(3,844)
Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Revenues									15,941	26,665	52,836
Interest expense, net									(465)	(486)	(548)
Operating (loss) income									(27,782)	(23,454)	(4,922)
Capital expenditures									20	2,283	15,874
Depreciation and amortization expense									26,221	30,370	35,472
Equipment Manufacturing and Sales [Member]
Segment Reporting Information [Line Items]
Revenues									25,100	25,350	30,872
Interest expense, net									(178)	(239)	(125)
Operating (loss) income									(508)	279	2,178
Capital expenditures									263	226	4,026
Depreciation and amortization expense									$ 2,054	$ 1,741	$ 1,514