CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 297,620us-gaap_SalesRevenueNet	$ 279,983us-gaap_SalesRevenueNet
Cost of goods sold	226,299us-gaap_CostOfGoodsSold	214,741us-gaap_CostOfGoodsSold
Gross profit	71,321us-gaap_GrossProfit	65,242us-gaap_GrossProfit
Selling, general and administrative expenses	70,132	67,127
Depreciation expense	2,075us-gaap_DepreciationNonproduction	1,468us-gaap_DepreciationNonproduction
Amortization expense	563us-gaap_AmortizationOfIntangibleAssets	563us-gaap_AmortizationOfIntangibleAssets
Impairment of assets held for sale	0	48
Public offering transaction-related costs	0stck_PublicOfferingExpense	448stck_PublicOfferingExpense
Restructuring expense	192us-gaap_RestructuringCharges	7us-gaap_RestructuringCharges
Total operating expenses	72,962us-gaap_OperatingExpenses	69,661us-gaap_OperatingExpenses
Loss from operations	(1,641)us-gaap_OperatingIncomeLoss	(4,419)us-gaap_OperatingIncomeLoss
Other income (expense)
Interest expense	(711)us-gaap_InterestExpense	(631)us-gaap_InterestExpense
Other income, net	612us-gaap_NonoperatingIncomeExpense	243us-gaap_NonoperatingIncomeExpense
Loss from continuing operations before income taxes	(1,740)	(4,807)
Income tax benefit	(3,591)us-gaap_IncomeTaxExpenseBenefit	(1,498)us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations	1,851	(3,309)
Income from discontinued operations, net of income tax expense of $5 and $14, respectively	8	21
Net income (loss)	$ 1,859us-gaap_NetIncomeLoss	$ (3,288)us-gaap_NetIncomeLoss
Weighted average common shares outstanding
Basic (in shares)	26,092,117	25,684,014
Diluted (in shares)	26,268,186	25,684,014
Basic and diluted income (loss) per share
Income (loss) from continuing operations (in dollars per share)	$ 0.07	$ (0.13)
Income from discontinued operations (in dollars per share)	$ 0.00	$ 0.00
Net income (loss) per share (in dollars per share)	$ 0.07us-gaap_EarningsPerShareBasicAndDiluted	$ (0.13)us-gaap_EarningsPerShareBasicAndDiluted

Amount of expenses associated with the offering of stock to the public.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation, when the per share amount is the same.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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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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Amount of the cost of borrowed funds accounted for as interest expense.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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