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BUSINESS ACQUISITIONS (Details) (USD $) | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Jan. 02, 2014 | May 01, 2014
Purchase price allocation [Abstract] |  |  |  |  |  |
Cash | $ 3,344,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents |  |  |  |  |
Accounts Receivable, net | 57,104,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables |  |  |  |  |
Inventory | 8,994,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory |  |  |  |  |
Property and equipment | 15,130,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment |  |  |  |  |
Goodwill and intangibles | 267,817,000 dxpe_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillAndIntangibles | [1] |  |  |  |
Other assets | 1,850,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets |  |  |  |  |
Assets acquired | 354,239,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets |  |  |  |  |
Current liabilities assumed | 30,026,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities |  |  |  |  |
Non-current liabilities assumed | 15,992,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities |  |  |  |  |
Net assets acquired | 308,221,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |  |  |  |
Goodwill acquired | 253,312,000 us-gaap_Goodwill |  | 253,312,000 us-gaap_Goodwill |  |  |
Goodwill impairment expense |  |  | 117,600,000 us-gaap_GoodwillImpairmentLoss |  |  |
Pro Forma Information [Abstract] |  |  |  |  |  |
Net sales | 341,594,000 us-gaap_BusinessAcquisitionsProFormaRevenue |  |  | 358,304,000 us-gaap_BusinessAcquisitionsProFormaRevenue |  |
Net income | 9,651,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |  |  | 11,876,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |  |
Per share data [Abstract] |  |  |  |  |  |
Basic earnings (in dollars per share) | $ 0.67 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic |  |  | $ 0.81 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic |  |
Diluted earnings (in dollars per share) | $ 0.63 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted |  |  | $ 0.76 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted |  |
Business acquired in 2014 [Member] |  |  |  |  |  |
Purchase price allocation [Abstract] |  |  |  |  |  |
Maximum period of information after acquisition date for revision in estimates | 1 year |  |  |  |  |
Sales from business acquisitions | 43,700,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_StatementScenarioAxis = dxpe_BusinessAcquiredInYearTwoMember |  |  |  |  |
Earnings (loss) before taxes from business acquisitions | 1,400,000 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_StatementScenarioAxis = dxpe_BusinessAcquiredInYearTwoMember |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Purchase price allocation [Abstract] |  |  |  |  |  |
Discount rate for valuation of acquired intangibles (in hundredths) |  |  | 10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Maximum [Member] |  |  |  |  |  |
Purchase price allocation [Abstract] |  |  |  |  |  |
Discount rate for valuation of acquired intangibles (in hundredths) |  |  | 13.50%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
B27, LLC [Member] |  |  |  |  |  |
Purchase price allocation [Abstract] |  |  |  |  |  |
Cash | 2,538,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |  |  |
Accounts Receivable, net | 51,448,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |  |  |
Inventory | 6,472,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |  |  |
Property and equipment | 14,573,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |  |  |
Goodwill and intangibles | 259,412,000 dxpe_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillAndIntangibles / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember | [1] |  |  |  |
Other assets | 1,791,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |  |  |
Assets acquired | 336,234,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |  |  |
Current liabilities assumed | 26,690,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |  |  |
Non-current liabilities assumed | 15,992,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |  |  |
Net assets acquired | 293,552,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |  |  |
Purchase price |  |  |  |  | 293,600,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
Number of shares issued on acquisition (in shares) |  |  |  |  | 36,000 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
Goodwill acquired |  |  |  |  | 178,300,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
Goodwill impairment expense |  |  | 105,300,000 us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |
Intangible assets acquired |  |  |  |  | 81,100,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
Purchase price financed under common stock issued |  |  |  |  | 4,000,000 us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
Transaction cost |  |  |  |  | 1,000,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
Nontax deductible goodwill or intangible assets |  |  |  |  | 154,600,000 dxpe_BusinessAcquisitionGoodwillNotExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
Discount rate for valuation of acquired intangibles (in hundredths) | 13.50%us-gaap_FairValueInputsDiscountRate / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |  |  |  |  |
Machinery Tooling and Supply LLC [Member] |  |  |  |  |  |
Purchase price allocation [Abstract] |  |  |  |  |  |
Cash | 806,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember |  |  |  |  |
Accounts Receivable, net | 5,656,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember |  |  |  |  |
Inventory | 2,522,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember |  |  |  |  |
Property and equipment | 557,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember |  |  |  |  |
Goodwill and intangibles | 8,405,000 dxpe_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillAndIntangibles / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember | [1] |  |  |  |
Other assets | 59,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember |  |  |  |  |
Assets acquired | 18,005,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember |  |  |  |  |
Current liabilities assumed | 3,336,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember |  |  |  |  |
Non-current liabilities assumed | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember |  |  |  |  |
Net assets acquired | 14,669,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember |  |  |  |  |
Purchase price |  |  |  |  |  | 14,700,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember
Goodwill acquired |  |  |  |  |  | 4,300,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember
Intangible assets acquired |  |  |  |  |  | $ 4,100,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = dxpe_MachineryToolingAndSupplyLlcMember
[1] | The amounts in the table above do not reflect the $105.3 million of goodwill impairment charges for B27 recorded in the fourth quarter of 2014.

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