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

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- 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 + Details
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- 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 + Details
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