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

X

- 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
Period Type:	duration

X

- 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
Period Type:	duration

X

- 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

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Namespace Prefix:	us-gaap_
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- Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- 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

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