Long-Term Debt and Notes Payable - Long-Term Debt and Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Jan. 31, 2014
Debt Instrument [Line Items]
Long-term debt gross	$ 25,144	$ 22,200
Long-term debt gross	25,144	22,200
Less current portion	(22)	(75)
Long-term debt	25,122	22,125
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt gross	25,000	22,000
Other Equipment Notes [Member]
Debt Instrument [Line Items]
Long-term debt gross	$ 144	$ 200