Acquired Intangible Assets - Fair Value of Certain Acquired Identifiable Intangible Assets and Related Estimates of Useful Lives (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired identifiable intangible assets, fair value	$ 3,543	$ 3,543
Intellectual Properties [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired identifiable intangible assets, fair value	3,505
Acquired identifiable intangible assets, estimated useful life	10 years
Access to Facilities Contract [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired identifiable intangible assets, fair value	$ 38	$ 38
Acquired identifiable intangible assets, estimated useful life	1 year