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Segment Information (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 6 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 | Dec. 31, 2012 Rotating Electrical [Member] | Dec. 31, 2011 Rotating Electrical [Member] | Dec. 31, 2012 Rotating Electrical [Member] | Dec. 31, 2011 Rotating Electrical [Member] | Mar. 31, 2012 Rotating Electrical [Member] | Dec. 31, 2012 Undercar Product Line [Member] | Dec. 31, 2011 Undercar Product Line [Member] | Dec. 31, 2012 Undercar Product Line [Member] | Dec. 31, 2011 Undercar Product Line [Member] | Mar. 31, 2012 Undercar Product Line [Member] | Sep. 30, 2012 Undercar Product Line [Member] Customer C [Member] | Mar. 31, 2012 Undercar Product Line [Member] Customer C [Member] | Dec. 31, 2012 Eliminations [Member] | Dec. 31, 2011 Eliminations [Member] | Dec. 31, 2012 Eliminations [Member] | Dec. 31, 2011 Eliminations [Member] | Mar. 31, 2012 Eliminations [Member]
Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of sales represented by a major non-profitable customer (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31.00% | 20.80% |  |  |  |  |
Selected income statement data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized in revenue from the reduction of obligation to provide credit for Remanufactured Cores |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,783,000 |  |  |  |  |  |  |  |  |
Long term core inventory reclassed to cost of goods sold due to change in relationship |  |  |  |  |  |  |  |  |  |  |  |  | 31,649,000 |  |  |  |  |  |  |  |  |
Net sales to external customers | 116,275,000 | 84,097,000 | 316,930,000 | 262,223,000 |  | 50,658,000 | 41,895,000 | 155,109,000 | 126,648,000 |  | 65,617,000 | 42,202,000 | 161,821,000 | 135,575,000 |  |  |  | 0 | 0 | 0 | 0 |
Intersegment revenue, net of cost |  | 0 |  | 0 |  |  | 241,000 |  | 1,853,000 |  |  | 0 |  | 0 |  |  |  |  | (241,000) |  | (1,853,000) |
Gross profit (loss) | 24,043,000 | (1,581,000) | 52,878,000 | 20,431,000 |  | 16,326,000 | 12,636,000 | 51,241,000 | 40,483,000 |  | 7,717,000 | (14,217,000) | 1,637,000 | (20,052,000) |  |  |  | 0 | 0 | 0 | 0 |
Operating income (loss) | 7,770,000 | (16,589,000) | 5,508,000 | (21,375,000) |  | 5,050,000 | 5,630,000 | 25,266,000 | 15,902,000 |  | 2,720,000 | (22,219,000) | (19,758,000) | (37,277,000) |  |  |  | 0 | 0 | 0 | 0 |
Net income (loss) | 935,000 | (21,827,000) | (17,860,000) | (35,571,000) |  | 1,786,000 | 3,028,000 | 10,656,000 | 8,280,000 |  | (851,000) | (24,855,000) | (28,516,000) | (43,851,000) |  |  |  | 0 | 0 | 0 | 0 |
Selected balance sheet data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 141,349,000 |  | 141,349,000 |  | 168,231,000 | 108,879,000 |  | 108,879,000 |  | 115,451,000 | 64,119,000 |  | 64,119,000 |  | 81,778,000 |  |  | (31,649,000) |  | (31,649,000) |  | (28,998,000)
Non-current assets | 301,293,000 |  | 301,293,000 |  | 333,667,000 | 218,217,000 |  | 218,217,000 |  | 179,167,000 | 139,141,000 |  | 139,141,000 |  | 186,896,000 |  |  | (56,065,000) |  | (56,065,000) |  | (32,396,000)
TOTAL ASSETS | 442,642,000 |  | 442,642,000 |  | 501,898,000 | 327,096,000 |  | 327,096,000 |  | 294,618,000 | 203,260,000 |  | 203,260,000 |  | 268,674,000 |  |  | (87,714,000) |  | (87,714,000) |  | (61,394,000)
Current liabilities | 169,296,000 |  | 169,296,000 |  | 170,419,000 | 69,913,000 |  | 69,913,000 |  | 72,987,000 | 132,533,000 |  | 132,533,000 |  | 126,430,000 |  |  | (33,150,000) |  | (33,150,000) |  | (28,998,000)
Non-current liabilities | 203,062,000 |  | 203,062,000 |  | 257,860,000 | 95,569,000 |  | 95,569,000 |  | 85,201,000 | 157,111,000 |  | 157,111,000 |  | 200,112,000 |  |  | (49,618,000) |  | (49,618,000) |  | (27,453,000)
Total liabilities | 372,358,000 |  | 372,358,000 |  | 428,279,000 | 165,482,000 |  | 165,482,000 |  | 158,188,000 | 289,644,000 |  | 289,644,000 |  | 326,542,000 |  |  | (82,768,000) |  | (82,768,000) |  | (56,451,000)
Equity (deficit) | 70,284,000 |  | 70,284,000 |  | 73,619,000 | 161,614,000 |  | 161,614,000 |  | 136,430,000 | (86,384,000) |  | (86,384,000) |  | (57,868,000) |  |  | (4,946,000) |  | (4,946,000) |  | (4,943,000)
Total liabilities and equity | 442,642,000 |  | 442,642,000 |  | 501,898,000 | 327,096,000 |  | 327,096,000 |  | 294,618,000 | 203,260,000 |  | 203,260,000 |  | 268,674,000 |  |  | (87,714,000) |  | (87,714,000) |  | (61,394,000)
Selected Cash Flow Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by (used in) operating activities |  |  | (27,729,000) | (45,348,000) |  |  |  | (4,035,000) | 7,124,000 |  |  |  | (23,694,000) | (52,472,000) |  |  |  |  |  | 0 | 0 |
Net cash used in investing activities |  |  | (3,057,000) | (1,097,000) |  |  |  | (1,656,000) | (775,000) |  |  |  | (1,401,000) | (322,000) |  |  |  |  |  | 0 | 0 |
Net cash provided by financing activities |  |  | 23,251,000 | 47,209,000 |  |  |  | 22,514,000 | 39,209,000 |  |  |  | 737,000 | 8,000,000 |  |  |  |  |  |  | 0 |
Effect of exchange rate changes on cash |  |  | (12,000) | (108,000) |  |  |  | (12,000) | (108,000) |  |  |  | 0 | 0 |  |  |  |  |  |  | 0 |
Cash - Beginning of period |  |  | 32,617,000 | 2,477,000 |  |  |  | 32,379,000 | 2,477,000 |  |  |  | 238,000 | 0 |  |  |  |  |  |  | 0 |
Cash - End of period | 25,070,000 | 3,133,000 | 25,070,000 | 3,133,000 |  | 24,863,000 | 2,856,000 | 24,863,000 | 2,856,000 |  | 207,000 | 277,000 | 207,000 | 277,000 |  |  |  | 0 | 0 | 0 | 0 |
Additional selected financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  | 3,991,000 | 5,538,000 |  |  |  | 2,137,000 | 2,634,000 |  |  |  | 1,854,000 | 2,904,000 |  |  |  |  |  | 0 | 0 |
Capital expenditures |  |  | $ 3,026,000 | $ 1,068,000 |  |  |  | $ 1,625,000 | $ 746,000 |  |  |  | $ 1,401,000 | $ 322,000 |  |  |  |  |  | $ 0 | $ 0 |

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