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BUSINESS ACQUISITIONS (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Sep. 01, 2015 | Apr. 01, 2015 | May. 01, 2014 | Jan. 02, 2014 | Dec. 31, 2015 | Sep. 30, 2015 | [1] | Jun. 30, 2015 | [1] | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | [1] | Jun. 30, 2014 | [1] | Mar. 31, 2014 | [1] | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum period of information after acquisition date for revision in estimates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Goodwill on acquisition |  |  |  |  |  | $ 197,362 |  |  |  |  | $ 253,312 |  |  |  | $ 197,362 | $ 197,362 | $ 253,312 | $ 188,110
Impairment charges |  |  |  |  |  | 9,800 | $ 58,900 | $ 0 | $ 0 | [1] | 117,600 | $ 0 | $ 0 | $ 0 |  | 67,663 | 117,569 |
Deferred tax liability |  |  |  |  |  | 600 |  |  |  |  | 16,000 |  |  |  | 600 | 600 | 16,000 |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,348 | 0 | 0
Business Acquired during 2014 and 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales from business acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,100 | 171,100 |
Earnings (loss) before taxes and impairment from business acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 | (91,500) |
Impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,700 |  |
Tool Supply, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill on acquisition |  |  |  |  |  |  |  |  | 2,900 |  |  |  |  |  |  |  |  |
Intangible assets on acquisition |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |
Purchase price allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 | 0 |  |
Accounts Receivable, net |  |  |  |  |  | 442 |  |  |  |  |  |  |  |  | 442 | 442 |  |
Inventory |  |  |  |  |  | 475 |  |  |  |  |  |  |  |  | 475 | 475 |  |
Property and equipment |  |  |  |  |  | 42 |  |  |  |  |  |  |  |  | 42 | 42 |  |
Goodwill and intangibles | [2] |  |  |  |  | 4,929 |  |  |  |  |  |  |  |  | 4,929 | 4,929 |  |
Other assets |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  | 100 | 100 |  |
Assets acquired |  |  |  |  |  | 5,988 |  |  |  |  |  |  |  |  | 5,988 | 5,988 |  |
Current liabilities assumed |  |  |  |  |  | (335) |  |  |  |  |  |  |  |  | (335) | (335) |  |
Non-current liabilities assumed | [3] |  |  |  |  | (653) |  |  |  |  |  |  |  |  | (653) | (653) |  |
Net assets acquired |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |  | 5,000 | 5,000 |  |
Cortech Engineering, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 14,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price financed under common stock issued |  | $ 4,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued on acquisition (in shares) |  | 148,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill on acquisition |  | $ 8,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets on acquisition |  | $ 5,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nontax deductible goodwill or intangible assets |  |  |  |  | $ 4,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 | 0 |  |
Accounts Receivable, net |  |  |  |  |  | 2,293 |  |  |  |  |  |  |  |  | 2,293 | 2,293 |  |
Inventory |  |  |  |  |  | 1,243 |  |  |  |  |  |  |  |  | 1,243 | 1,243 |  |
Property and equipment |  |  |  |  |  | 253 |  |  |  |  |  |  |  |  | 253 | 253 |  |
Goodwill and intangibles | [2] |  |  |  |  | 14,048 |  |  |  |  |  |  |  |  | 14,048 | 14,048 |  |
Other assets |  |  |  |  |  | 21 |  |  |  |  |  |  |  |  | 21 | 21 |  |
Assets acquired |  |  |  |  |  | 17,858 |  |  |  |  |  |  |  |  | 17,858 | 17,858 |  |
Current liabilities assumed |  |  |  |  |  | (2,610) |  |  |  |  |  |  |  |  | (2,610) | (2,610) |  |
Non-current liabilities assumed | [3] |  |  |  |  | (349) |  |  |  |  |  |  |  |  | (349) | (349) |  |
Net assets acquired |  |  |  |  |  | 14,899 |  |  |  |  |  |  |  |  | 14,899 | $ 14,899 |  |
B27, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | 304,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction cost |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price financed under common stock issued |  |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued on acquisition (in shares) |  |  |  |  | 36,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill on acquisition |  |  |  |  | $ 178,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets on acquisition |  |  |  |  | 81,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Nontax deductible goodwill or intangible assets |  |  |  |  | $ 154,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for valuation of acquired intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.50% |  |
Impairment charges |  |  |  |  |  |  |  |  |  |  | 105,300 |  |  |  | 67,700 |  |  |
Expected payment to resolve working capital dispute |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,300 |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,300 |
Required payment tax refund |  |  |  |  |  | 4,000 |  |  |  |  |  |  |  |  | $ 4,000 | $ 4,000 |  |
Federal portion of refund received |  |  |  |  |  | $ 3,600 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  | 2,538 |  |  |  |  |  | 2,538 |
Accounts Receivable, net |  |  |  |  |  |  |  |  |  |  | 51,448 |  |  |  |  |  | 51,448 |
Inventory |  |  |  |  |  |  |  |  |  |  | 6,472 |  |  |  |  |  | 6,472 |
Property and equipment |  |  |  |  |  |  |  |  |  |  | 14,573 |  |  |  |  |  | 14,573 |
Goodwill and intangibles | [2] |  |  |  |  |  |  |  |  |  | 259,412 |  |  |  |  |  | 259,412 |
Other assets |  |  |  |  |  |  |  |  |  |  | 1,791 |  |  |  |  |  | 1,791 |
Assets acquired |  |  |  |  |  |  |  |  |  |  | 336,234 |  |  |  |  |  | 336,234 |
Current liabilities assumed |  |  |  |  |  |  |  |  |  |  | (26,690) |  |  |  |  |  | (26,690) |
Non-current liabilities assumed | [3] |  |  |  |  |  |  |  |  |  | (15,992) |  |  |  |  |  | (15,992) |
Net assets acquired |  |  |  |  |  |  |  |  |  |  | 293,552 |  |  |  |  |  | 293,552 |
Machinery Tooling and Supply LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 14,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill on acquisition |  |  |  | 4,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets on acquisition |  |  |  | $ 4,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  | 806 |  |  |  |  |  | 806 |
Accounts Receivable, net |  |  |  |  |  |  |  |  |  |  | 5,656 |  |  |  |  |  | 5,656 |
Inventory |  |  |  |  |  |  |  |  |  |  | 2,522 |  |  |  |  |  | 2,522 |
Property and equipment |  |  |  |  |  |  |  |  |  |  | 557 |  |  |  |  |  | 557 |
Goodwill and intangibles | [2] |  |  |  |  |  |  |  |  |  | 8,405 |  |  |  |  |  | 8,405 |
Other assets |  |  |  |  |  |  |  |  |  |  | 59 |  |  |  |  |  | 59 |
Assets acquired |  |  |  |  |  |  |  |  |  |  | 18,005 |  |  |  |  |  | 18,005 |
Current liabilities assumed |  |  |  |  |  |  |  |  |  |  | (3,336) |  |  |  |  |  | (3,336) |
Non-current liabilities assumed | [3] |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |
Net assets acquired |  |  |  |  |  |  |  |  |  |  | $ 14,669 |  |  |  |  |  | 14,669 |
Units Acquired in 2013 and 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,263,000 | 1,541,000 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (37,000) | $ (44,000) |
Per share data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2.60) | $ (2.99) |
Diluted earnings (loss) (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2.60) | $ (2.99) |
Units Acquired in 2012 and 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,513,000 | 1,496,000
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (45,000) | $ 71,000
Per share data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3.08) | $ 4.90
Diluted earnings (loss) (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3.08) | $ 4.64
[1] | During the fourth quarter of 2014, DXP finalized its purchase accounting for customer relationships for the acquisition of B27 and amortized the customer relationships on an accelerated basis. The revision increased amortization expense by $1.0 million per quarter.
[2] | The amounts in the table above have not been reduced by the $105.3 million, or the $67.7 million, of goodwill impairment charges for B27 recorded in the fourth quarter of 2014 and the second half of 2015, respectively.
[3] | Includes deferred tax liability of $0.6 million and $16.0 million related to intangible assets acquired for 2015 and 2014, respectively.

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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