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INCOME TAXES (Schedule of Changes of Valuation Allowance) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
INCOME TAXES [Abstract] |  |  |
Beginning balance | $ 56,633,867 us-gaap_DeferredTaxAssetsValuationAllowance | $ 37,682,733 us-gaap_DeferredTaxAssetsValuationAllowance |
Additions (Reversal) | (5,168,917)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 56,697,096 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 37,238,701 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Deconsolidation |  | (39,357,744)dq_ValuationAllowanceDeferredTaxAssetAdjustmentForDeconsolidation |
Foreign exchange effect | (1,355,199)dq_ValuationAllowanceDeferredTaxAssetForeignExchangeEffect | 1,611,782 dq_ValuationAllowanceDeferredTaxAssetForeignExchangeEffect | 444,032 dq_ValuationAllowanceDeferredTaxAssetForeignExchangeEffect
Ending balance | $ 50,109,751 us-gaap_DeferredTaxAssetsValuationAllowance | $ 56,633,867 us-gaap_DeferredTaxAssetsValuationAllowance | $ 37,682,733 us-gaap_DeferredTaxAssetsValuationAllowance

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset, resulting from an adjustment for deconsolidation. + References No definition available. + Details
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Namespace Prefix: | dq_
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Balance Type: | credit
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset resulting from the effect of foreign exchange rates. + References No definition available. + Details
Name: | dq_ValuationAllowanceDeferredTaxAssetForeignExchangeEffect
Namespace Prefix: | dq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
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Period Type: | instant

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- Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration