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Business Segment and Geographic Information - Operating Results for Two Business Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 25,129 us-gaap_SalesRevenueNet | $ 21,250 us-gaap_SalesRevenueNet | $ 12,455 us-gaap_SalesRevenueNet | $ 11,696 us-gaap_SalesRevenueNet | $ 16,287 us-gaap_SalesRevenueNet | $ 20,563 us-gaap_SalesRevenueNet | $ 24,181 us-gaap_SalesRevenueNet | $ 23,086 us-gaap_SalesRevenueNet | $ 70,530 us-gaap_SalesRevenueNet | $ 84,117 us-gaap_SalesRevenueNet | $ 87,419 us-gaap_SalesRevenueNet
Operating loss | (5,715)us-gaap_OperatingIncomeLoss | (7,735)us-gaap_OperatingIncomeLoss | (26,400)us-gaap_OperatingIncomeLoss | (12,667)us-gaap_OperatingIncomeLoss | (14,876)us-gaap_OperatingIncomeLoss | (6,675)us-gaap_OperatingIncomeLoss | (11,028)us-gaap_OperatingIncomeLoss | (8,850)us-gaap_OperatingIncomeLoss | (52,517)us-gaap_OperatingIncomeLoss | (41,429)us-gaap_OperatingIncomeLoss | (57,741)us-gaap_OperatingIncomeLoss
Unallocated corporate expenses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss |  |  |  |  |  |  |  |  | (11,306)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (13,693)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (17,828)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Wind |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 51,307 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember | 55,608 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember | 44,231 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember
Wind | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss |  |  |  |  |  |  |  |  | (14,321)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember | (5,213)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember | (16,098)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember
Grid |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 19,223 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | 28,509 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | 43,188 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember
Grid | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss |  |  |  |  |  |  |  |  | $ (26,890)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | $ (22,523)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | $ (23,815)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember

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