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Related-Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Feb. 18, 2011	Jan. 31, 2015
Related Party Transactions [Abstract]
Principal amount of promissory note	$ 250us-gaap_DueToRelatedPartiesCurrent
Annual compound interest rate of promissory note	0.51%us-gaap_RelatedPartyTransactionRate
Expiration date of promissory note which includes principal and accrued interest		Feb. 18, 2014

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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