Condensed Consolidating Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 58,422	$ 57,929	$ 53,155	$ 95,978
Accounts receivable, net	100,551	98,947
Inventories, net	189,405	187,974
Prepaid expenses and other	41,886	36,871
Deferred income taxes	6,664	6,695
Current assets of discontinued operations	0	12,160
Total current assets	396,928	400,576
Property and equipment, net	290,572	292,648
Goodwill	35,584	35,584
Intangible assets, net	36,567	37,184
Investment in NEC TOKIN	45,235	46,419
Restricted cash	13,210	13,512
Deferred income taxes	6,659	6,778
Other assets	13,888	10,130
Non-current assets of discontinued operations	0	836
Total assets	838,643	843,667
Current liabilities:
Current portion of long-term debt	27,410	7,297
Accounts payable	83,623	74,818
Accrued expenses	70,372	76,468
Income taxes payable and deferred income taxes	612	980
Current liabilities of discontinued operations	0	7,269
Total current liabilities	182,017	166,832
Long-term debt, less current portion	376,427	391,292
Other non-current obligations	55,978	55,864
Deferred income taxes	5,970	5,203
Non-current liabilities of discontinued operations	0	2,592
Total stockholders’ equity	218,251	221,884
Total liabilities and stockholders’ equity	838,643	843,667
Reportable legal entities | Parent
Current assets:
Cash and cash equivalents	627	616	8,822	17,202
Intercompany receivable	319,335	318,582
Prepaid expenses and other	3,145	3,146
Total current assets	323,107	322,344
Property and equipment, net	318	329
Investments in subsidiaries	409,255	402,090
Other assets	5,084	5,415
Long-term intercompany receivable	80,976	81,746
Total assets	818,740	811,924
Current liabilities:
Current portion of long-term debt	19,324	5,988
Accounts payable	228	84
Intercompany payable	197,230	176,624
Accrued expenses	25,729	34,236
Total current liabilities	242,511	216,932
Long-term debt, less current portion	357,978	372,251
Other non-current obligations	0	857
Total stockholders’ equity	218,251	221,884
Total liabilities and stockholders’ equity	818,740	811,924
Reportable legal entities | Guarantor Subsidiaries
Condensed Consolidating Balance Sheet
Percentage of ownership interest	100.00%
Current assets:
Cash and cash equivalents	27,149	22,200	26,088	52,056
Accounts receivable, net	46,591	49,462
Intercompany receivable	358,102	329,211
Inventories, net	124,865	119,340
Prepaid expenses and other	18,705	15,286
Deferred income taxes	1,620	1,022
Total current assets	577,032	536,521
Property and equipment, net	104,543	104,874
Goodwill	35,584	35,584
Intangible assets, net	28,034	28,380
Investment in NEC TOKIN	45,235	46,419
Investments in subsidiaries	424,313	424,386
Restricted cash	13,210	13,512
Deferred income taxes	990	1,010
Other assets	7,874	3,895
Long-term intercompany receivable	63,643	60,663
Total assets	1,300,458	1,255,244
Current liabilities:
Current portion of long-term debt	7,500	0
Accounts payable	45,577	36,579
Intercompany payable	595,650	570,535
Accrued expenses	14,294	13,698
Income taxes payable and deferred income taxes	2,909	2,909
Total current liabilities	665,930	623,721
Long-term debt, less current portion	6,449	6,449
Other non-current obligations	5,071	3,311
Deferred income taxes	3,855	3,258
Long-term intercompany payable	80,976	81,747
Total stockholders’ equity	538,177	536,758
Total liabilities and stockholders’ equity	1,300,458	1,255,244
Reportable legal entities | Non-Guarantor Subsidiaries
Condensed Consolidating Balance Sheet
Percentage of capital stock	51.00%
Current assets:
Cash and cash equivalents	30,646	35,113	18,245	26,720
Accounts receivable, net	53,960	49,485
Intercompany receivable	228,417	203,018
Inventories, net	64,540	68,634
Prepaid expenses and other	22,977	21,380
Deferred income taxes	5,044	5,673
Current assets of discontinued operations		12,160
Total current assets	405,584	395,463
Property and equipment, net	185,711	187,445
Intangible assets, net	8,533	8,804
Investments in subsidiaries	30,285	30,285
Deferred income taxes	5,669	5,768
Other assets	930	820
Non-current assets of discontinued operations		836
Long-term intercompany receivable	2,800	2,801
Total assets	639,512	632,222
Current liabilities:
Current portion of long-term debt	586	1,309
Accounts payable	37,818	38,155
Intercompany payable	112,974	103,652
Accrued expenses	30,349	28,534
Income taxes payable and deferred income taxes	644	1,012
Current liabilities of discontinued operations		7,269
Total current liabilities	182,371	179,931
Long-term debt, less current portion	12,000	12,592
Other non-current obligations	50,907	51,696
Deferred income taxes	2,115	1,945
Non-current liabilities of discontinued operations		2,592
Long-term intercompany payable	66,443	63,463
Total stockholders’ equity	325,676	320,003
Total liabilities and stockholders’ equity	639,512	632,222
Reclassifications and Eliminations
Current assets:
Intercompany receivable	(905,854)	(850,811)
Prepaid expenses and other	(2,941)	(2,941)
Total current assets	(908,795)	(853,752)
Investments in subsidiaries	(863,853)	(856,761)
Long-term intercompany receivable	(147,419)	(145,210)
Total assets	(1,920,067)	(1,855,723)
Current liabilities:
Intercompany payable	(905,854)	(850,811)
Income taxes payable and deferred income taxes	(2,941)	(2,941)
Total current liabilities	(908,795)	(853,752)
Long-term intercompany payable	(147,419)	(145,210)
Total stockholders’ equity	(863,853)	(856,761)
Total liabilities and stockholders’ equity	$ (1,920,067)	$ (1,855,723)
10.5% Senior Notes
Condensed Consolidating Balance Sheet
Interest rate of senior notes (as a percent)	10.50%	10.50%