SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Sales	$ 307,942	$ 261,894	$ 598,039	$ 514,181
Operating income for reportable segments	34,626	33,332	69,975	62,951
Adjustment for [Abstract]
Amortization of intangibles	3,145	2,556	5,787	4,790
Corporate and other expense, net	8,216	9,929	18,219	17,409
Total operating income	23,265	20,847	45,969	40,752
Interest expense, net	1,689	762	3,316	1,591
Other expense (income), net	21	3	22	(12)
Income before income taxes	21,555	20,082	42,631	39,173
Service Centers [Member]
Segment Reporting Information [Line Items]
Sales	217,925	184,106	428,023	359,178
Operating income for reportable segments	23,376	22,491	48,420	41,045
IPS [Member]
Segment Reporting Information [Line Items]
Sales	52,954	35,177	94,477	74,612
Operating income for reportable segments	8,090	6,939	15,208	15,187
SCS [Member]
Segment Reporting Information [Line Items]
Sales	37,063	42,611	75,539	80,391
Operating income for reportable segments	$ 3,160	$ 3,902	$ 6,347	$ 6,719

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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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

-Name Regulation S-X (SX)

-Number 210

-Section 03

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