Commitments - Additional Information (Detail) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Commitments [Line Items]
Rent incurred on construction projects included in the costs of revenues	$ 3,612,000	$ 7,567,000	$ 4,386,000
Selling, General and Administrative Expenses [Member]
Commitments [Line Items]
Rent expense included in selling, general and administrative expenses of continuing operations	$ 171,000	$ 390,000	$ 443,000