SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Sales	$ 329,719	$ 289,923	$ 927,758	$ 804,104
Operating income for reportable segments	39,818	36,418	109,793	99,369
Adjustment for [Abstract]
Amortization of intangibles	3,434	3,474	9,221	8,264
Corporate and other expense, net	9,486	8,430	27,705	25,839
Operating income	26,898	24,514	72,867	65,266
Interest expense, net	1,614	2,287	4,930	3,878
Other income, net	(38)	(21)	(16)	(33)
Income before income taxes	25,322	22,248	67,953	61,421
Service Centers [Member]
Segment Reporting Information [Line Items]
Sales	232,529	212,497	660,552	571,675
Operating income for reportable segments	27,557	26,410	75,976	67,455
IPS [Member]
Segment Reporting Information [Line Items]
Sales	61,094	38,854	155,572	113,466
Operating income for reportable segments	9,059	7,227	24,267	22,414
SCS [Member]
Segment Reporting Information [Line Items]
Sales	36,096	38,572	111,634	118,963
Operating income for reportable segments	$ 3,202	$ 2,781	$ 9,550	$ 9,500

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Operating income for reportable segments before amortization of intangibles, corporate and other expense, net.

+ References

No definition available.

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

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- Definition

The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 34

-Paragraph 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 563c.102

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-Chapter V

-Subsection II

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

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- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7)

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-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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- Definition

The sum of expenses not otherwise specified in the taxonomy for managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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- Definition

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher SEC

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-Section 03

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