Senior Credit Facility - Additional Information (Detail) (Secured Credit Facility [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
Aug. 19, 2011	Jan. 31, 2015
Revolving Credit Facility Before Amendment [Member]
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 45
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	50
Extension of Company's senior secured revolving credit facility		2016-08
Interest rate on borrowings		Borrowings under the facility bear interest at an annual rate equal to LIBOR plus a margin ranging from 175 to 225 basis points with no LIBOR floor. Additionally, a fee of 0.375% per annum is assessed on the unused portion of the facility.
Percentage of fee on unused portion of the facility	0.375%
Outstanding borrowings under the credit facility		0
Available borrowing capacity of line of credit facility		$ 34.1
Revolving Credit Facility [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Interest at an annual rate equal to LIBOR plus a margin range	1.75%
Revolving Credit Facility [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Interest at an annual rate equal to LIBOR plus a margin range	2.25%

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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