Deferred Rent - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Oct. 31, 2013
Deferred Revenue Disclosure [Abstract]
Tenant improvement allowance	$ 1,958
Amortization of lease incentive	$ 148
Amortization of lease incentive period	4 months

Amount of amortization of lease incentive costs incurred by the lessor for the benefit of the lessee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e40010-112707

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e40019-112707

Name:	us-gaap_AmortizationOfLeaseIncentives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration