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Income Taxes - Reconciliation of Income Tax Expense at the Statutory Federal Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ 10,087us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 8,385us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 7,550us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes (net of federal benefit)	1,106us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	920us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	402us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Tax credits	(207)us-gaap_IncomeTaxReconciliationTaxCredits	(192)us-gaap_IncomeTaxReconciliationTaxCredits	(563)us-gaap_IncomeTaxReconciliationTaxCredits
Other	20us-gaap_IncomeTaxReconciliationOtherAdjustments	316us-gaap_IncomeTaxReconciliationOtherAdjustments	310us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense	$ 11,006us-gaap_IncomeTaxExpenseBenefit	$ 9,429us-gaap_IncomeTaxExpenseBenefit	$ 7,699us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Name Accounting Standards Codification

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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