Discontinued Operations - Narrative (Detail) (USD $)	0 Months Ended	9 Months Ended		1 Months Ended	6 Months Ended	9 Months Ended
	Oct. 02, 2013	Oct. 31, 2013	Oct. 31, 2012	Aug. 31, 2013 SolmeteX [Member]	Jul. 31, 2013 SolmeteX [Member]	Oct. 31, 2013 SolmeteX [Member]	Oct. 31, 2013 Other Assets [Member] SolmeteX [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from sale agreement of discontinued operation		$ 12,064,000	$ 13,500,000	$ 10,600,000
Preferred units of discontinued operation					750,000
Preferred units, percentage yield accruing daily and compounded quarterly					4.00%
Preferred units, valuation amount		432,000					432,000
Gain on sale of discontinued operations		8,333,000	(32,589,000)			8,300,000
Escrow proceeds	$ 1,500,000