Long-Term Debt and Notes Payable - Long-Term Debt and Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jan. 31, 2014
Debt Instrument [Line Items]
Long-term debt gross	$ 34,562	$ 22,200
Long-term debt gross	34,562	22,200
Less current portion	(2,421)	(75)
Long-term debt	32,141	22,125
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt gross	24,500	22,000
Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt gross	10,000
Other Equipment Notes [Member]
Debt Instrument [Line Items]
Long-term debt gross	$ 62	$ 200