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Commitments and Contingencies - Additional Information (Detail) | 0 Months Ended | 3 Months Ended |  |  | 0 Months Ended | 3 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended
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Nov. 19, 2013 USD ($) | Jul. 05, 2011 Claim | May 12, 2011 Employee Claim | Dec. 31, 2014 USD ($) | Jun. 11, 2014 USD ($) | Mar. 31, 2014 USD ($) | Jun. 17, 2011 Bonds USD ($) Claim | Aug. 29, 2014 Ghodawat Energy Pvt Ltd USD ($) | Aug. 29, 2014 Ghodawat Energy Pvt Ltd EUR (€) | Jan. 14, 2014 Ghodawat Energy Pvt Ltd USD ($) | May 12, 2011 Ghodawat Energy Pvt Ltd USD ($) | May 12, 2011 Ghodawat Energy Pvt Ltd EUR (€) | Dec. 31, 2014 Ghodawat Energy Pvt Ltd USD ($) | Sep. 30, 2014 Ghodawat Energy Pvt Ltd USD ($) | Dec. 31, 2014 Ghodawat Energy Pvt Ltd Scenario, Previously Reported USD ($) | Feb. 27, 2012 Sinovel Wind Group Co. Ltd. USD ($) | Feb. 27, 2012 Sinovel Wind Group Co. Ltd. CNY | Dec. 22, 2011 Sinovel Wind Group Co. Ltd. USD ($) | Dec. 22, 2011 Sinovel Wind Group Co. Ltd. CNY | Oct. 17, 2011 Sinovel Wind Group Co. Ltd. USD ($) | Oct. 17, 2011 Sinovel Wind Group Co. Ltd. CNY | Oct. 08, 2011 Sinovel Wind Group Co. Ltd. USD ($) | Oct. 08, 2011 Sinovel Wind Group Co. Ltd. CNY | Sep. 13, 2011 Sinovel Wind Group Co. Ltd. USD ($) | Sep. 13, 2011 Sinovel Wind Group Co. Ltd. CNY | Mar. 31, 2011 Sinovel Wind Group Co. Ltd. USD ($) | Mar. 31, 2011 Sinovel Wind Group Co. Ltd. CNY | Sep. 16, 2011 Dalian Guotong Electric Co. Ltd. USD ($) | Sep. 16, 2011 Dalian Guotong Electric Co. Ltd. CNY | Feb. 04, 2015 Subsequent Event Ghodawat Energy Pvt Ltd USD ($) | Feb. 04, 2015 Subsequent Event Ghodawat Energy Pvt Ltd EUR (€)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adverse purchase commitments |  |  |  | $ 0 us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted |  | $ 402,000 us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sought compensation amount | 10,000,000 us-gaap_LossContingencyDamagesSoughtValue |  |  |  |  |  |  |  |  |  | 24,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember | 18,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember |  |  |  | 17,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 105,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 190,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 1,200,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 157,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 1,000,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 58,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 370,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember |  |  | 76,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 485,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember |  |  |  |
Counterclaims under License Agreement |  |  |  |  |  |  |  |  |  |  | 8,000,000 amsc_CounterclaimForDamagesSought / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember | 6,000,000 amsc_CounterclaimForDamagesSought / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for damages |  |  |  |  |  |  | 475,000 us-gaap_LossContingencyDamagesAwardedValue / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_BondsMember | 10,100,000 us-gaap_LossContingencyDamagesAwardedValue / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember | 8,300,000 us-gaap_LossContingencyDamagesAwardedValue / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate accrued on liability for damage |  |  |  |  |  |  |  | 5.33%amsc_LossContingencyInterestRate / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember | 5.33%amsc_LossContingencyInterestRate / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency recorded |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,200,000 us-gaap_LossContingencyLossInPeriod / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember | 500,000 us-gaap_LossContingencyLossInPeriod / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement of arbitration expenses |  |  |  |  |  |  |  |  |  | 2,300,000 amsc_ReimbursementOfArbitrationExpenses / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected reversal of previously reimbursed expense |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 amsc_AccruedExpenseReversal / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,500,000 us-gaap_LitigationSettlementAmount / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 7,450,000 us-gaap_LitigationSettlementAmount / dei_LegalEntityAxis = amsc_GhodawatEnergyPvtLtdMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Expected gain on reversal accrued arbitration liability |  |  |  | 1,300,000 us-gaap_GainLossRelatedToLitigationSettlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of putative securities complaints |  |  | 7 us-gaap_LossContingencyNewClaimsFiledNumber |  |  |  | 4 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis = us-gaap_BondsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of officers putative securities filed against |  |  | 2 amsc_NumberOfOfficersPutativeSecuritiesFiledAgainst |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints additionally asserted claims against the underwriters |  |  | 1 amsc_NumberOfComplaintAdditionallyAssertedClaimsAgainstUnderwriters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount expected to be funded by insurers |  |  |  | 8,200,000 us-gaap_InsuranceSettlementsReceivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount expected to be paid by issuance of common stock |  |  |  | 1,800,000 amsc_SettlementAmountExpectedToBePaidByIssuanceOfCommonStock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, capital shares reserved for future issuance |  |  |  | 944,882 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shortfall payment |  |  |  |  | 500,000 amsc_ShortfallPayment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims consolidated |  | 3 amsc_LossContingencyNumberOfClaimsConsolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of the undelivered components |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 720,000,000 amsc_SupplyCommitmentRemainingMinimumAmountCommitted / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 4,600,000,000 amsc_SupplyCommitmentRemainingMinimumAmountCommitted / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember |  |  |  |
Damages claimed for unauthorized use of software |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 amsc_DamagesClaimedForUnauthorizedUseOfSoftware / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 38,000,000 amsc_DamagesClaimedForUnauthorizedUseOfSoftware / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember |  |  |  |  |  |
Monetary damages for trade secret infringement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 453,000,000 amsc_MonetaryDamagesForTradeSecretInfringement / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember | 2,900,000,000 amsc_MonetaryDamagesForTradeSecretInfringement / dei_LegalEntityAxis = amsc_SinovelWindGroupCoLtdMember |  |  |  |  |  |
Monetary losses from copyright infringement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 amsc_MonetaryLossesFromCopyrightInfringement / dei_LegalEntityAxis = amsc_DalianGuotongElectricCoLtdMember | 1,200,000 amsc_MonetaryLossesFromCopyrightInfringement / dei_LegalEntityAxis = amsc_DalianGuotongElectricCoLtdMember |  |
Restricted cash included in current assets |  |  |  | 1,508,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  | 2,913,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  | $ 100,000 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent |  | $ 3,394,000 us-gaap_RestrictedCashAndCashEquivalentsNoncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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