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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Additional Information) (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2015
May 30, 2014
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basis of presentation              
Working capital       $ (274,118,480)dq_WorkingCapital      
Cash and cash equivalents       7,068,483us-gaap_CashAndCashEquivalentsAtCarryingValue 7,831,084us-gaap_CashAndCashEquivalentsAtCarryingValue 6,679,024us-gaap_CashAndCashEquivalentsAtCarryingValue 92,697,098us-gaap_CashAndCashEquivalentsAtCarryingValue
Rolled over, renewed or replaced borrowings     30,600,000us-gaap_ShortTermDebtRefinancedAmount        
Short-term bank borrowings       90,443,007us-gaap_ShortTermBorrowings      
Current portion of long-term debt       69,360,869us-gaap_LongTermDebtCurrent 50,049,843us-gaap_LongTermDebtCurrent    
Capital commitment       20,400,000us-gaap_OtherCommitmentDueInNextTwelveMonths      
Follow-on equity offering, net of issuance costs 28,000,000us-gaap_StockIssuedDuringPeriodValueOther 54,600,000us-gaap_StockIssuedDuringPeriodValueOther   54,624,447us-gaap_StockIssuedDuringPeriodValueOther      
Net income       16,649,176us-gaap_ProfitLoss (221,090,508)us-gaap_ProfitLoss (115,637,415)us-gaap_ProfitLoss  
Cash flow from operations       45,619,729us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (16,525,817)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (10,307,234)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations  
Restricted cash              
Restricted cash       22,169,236us-gaap_RestrictedCashAndCashEquivalents 8,826,110us-gaap_RestrictedCashAndCashEquivalents    
Inventories              
Inventory write-down       175,568us-gaap_InventoryWriteDown 29,905,734us-gaap_InventoryWriteDown 14,821,620us-gaap_InventoryWriteDown  
Prepaid land use rights              
Lease Expenses       628,052us-gaap_LeaseAndRentalExpense 781,706us-gaap_LeaseAndRentalExpense 958,558us-gaap_LeaseAndRentalExpense  
Impairment of long-lived assets              
Long-lived asset impairment          158,424,827us-gaap_AssetImpairmentCharges 42,754,481us-gaap_AssetImpairmentCharges  
Shipping and handling              
Shipping and handling costs       2,054,786us-gaap_ShippingHandlingAndTransportationCosts 1,901,384us-gaap_ShippingHandlingAndTransportationCosts 1,033,808us-gaap_ShippingHandlingAndTransportationCosts  
Government subsidies              
Unrestricted cash government subsidies       926,173dq_UnrestrictedCashSubsidies 5,249,788dq_UnrestrictedCashSubsidies 9,250,296dq_UnrestrictedCashSubsidies  
Government grants related to assets       113,735dq_GrantsRelatedToAssetsReceived 1,172,160dq_GrantsRelatedToAssetsReceived 1,383,487dq_GrantsRelatedToAssetsReceived  
Earnings per share              
Ordinary shares from options included in calculation of dilutive earnings per share       5,003,667us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements        
Foreign currency translation              
Aggregate amount of cash and cash equivalents and restricted cash denominated in RMB       24,356,970us-gaap_AssetReportingCurrencyDenominatedValue 11,436,370us-gaap_AssetReportingCurrencyDenominatedValue    
Noncontrolling interest              
Noncontrolling interest               
Treasury Stock              
Share repurchase program, authorized amount           5,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1  
Purchase price of treasury stock             500,724us-gaap_PaymentsForRepurchaseOfCommonStock  
Common Stock Outstanding [Member]              
Basis of presentation              
Follow-on equity offering, net of issuance costs       5,000us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= dq_CommonStockOutstandingMember		      
Net income                 
Treasury Stock              
Number of shares repurchased           2,836,670us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementEquityComponentsAxis
= dq_CommonStockOutstandingMember