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

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