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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Concentration of Credit Risk) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Concentration of credit risk
Accounts receivable, allowance for doubtful accounts	3,189,110us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent		7,160,782us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable	8,714,261us-gaap_AccountsReceivableNetCurrent		9,909,662us-gaap_AccountsReceivableNetCurrent
Sales [Member]
Concentration of credit risk
Concentration risk, percentage	23.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember		30.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember		25.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember
Customer A [Member]
Concentration of credit risk
Accounts receivable		[1]	3,673,455us-gaap_AccountsReceivableNetCurrent / us-gaap_MajorCustomersAxis = dq_CustomerMember
Customer B [Member]
Concentration of credit risk
Accounts receivable		[1]	1,225,831us-gaap_AccountsReceivableNetCurrent / us-gaap_MajorCustomersAxis = dq_CustomerBMember
Customer C [Member]
Concentration of credit risk
Accounts receivable	2,213,393us-gaap_AccountsReceivableNetCurrent / us-gaap_MajorCustomersAxis = dq_CustomerCMember		1,507,576us-gaap_AccountsReceivableNetCurrent / us-gaap_MajorCustomersAxis = dq_CustomerCMember
Customer D [Member]
Concentration of credit risk
Accounts receivable	1,578,947us-gaap_AccountsReceivableNetCurrent / us-gaap_MajorCustomersAxis = dq_CustomerDMember			[1]
Customer E [Member]
Concentration of credit risk
Accounts receivable	1,330,145us-gaap_AccountsReceivableNetCurrent / us-gaap_MajorCustomersAxis = dq_CustomerEMember			[1]
Customer F [Member]
Concentration of credit risk
Accounts receivable	1,071,415us-gaap_AccountsReceivableNetCurrent / us-gaap_MajorCustomersAxis = dq_CustomerFMember			[1]
[1] Represents less than 10%

X

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3-4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a(1)

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5

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X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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