Segment Reporting (Details) (USD $)	3 Months Ended								12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		10 Months Ended	12 Months Ended		2 Months Ended														10 Months Ended	12 Months Ended		2 Months Ended			10 Months Ended	12 Months Ended		2 Months Ended			10 Months Ended	12 Months Ended		2 Months Ended			10 Months Ended	12 Months Ended		2 Months Ended			10 Months Ended	12 Months Ended		2 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010 Successor [Member]	Dec. 31, 2012 Successor [Member]	Dec. 31, 2011 Successor [Member]	Dec. 31, 2010 Successor [Member] Wheels [Member]	Dec. 31, 2012 Successor [Member] Wheels [Member]	Dec. 31, 2011 Successor [Member] Wheels [Member]	Dec. 31, 2010 Successor [Member] Wheel end components and assemblies [Member]	Dec. 31, 2012 Successor [Member] Wheel end components and assemblies [Member]	Dec. 31, 2011 Successor [Member] Wheel end components and assemblies [Member]	Dec. 31, 2010 Successor [Member] Truck body and chassis parts [Member]	Dec. 31, 2012 Successor [Member] Truck body and chassis parts [Member]	Dec. 31, 2011 Successor [Member] Truck body and chassis parts [Member]	Dec. 31, 2010 Successor [Member] Ductile and gray iron castings [Member]	Dec. 31, 2012 Successor [Member] Ductile and gray iron castings [Member]	Dec. 31, 2011 Successor [Member] Ductile and gray iron castings [Member]	Dec. 31, 2010 Successor [Member] Customer One [Member]	Dec. 31, 2012 Successor [Member] Customer One [Member]	Dec. 31, 2011 Successor [Member] Customer One [Member]	Dec. 31, 2010 Successor [Member] Customer Two [Member]	Dec. 31, 2012 Successor [Member] Customer Two [Member]	Dec. 31, 2011 Successor [Member] Customer Two [Member]	Dec. 31, 2010 Successor [Member] Customer Three [Member]	Dec. 31, 2012 Successor [Member] Customer Three [Member]	Dec. 31, 2011 Successor [Member] Customer Three [Member]	Dec. 31, 2010 Successor [Member] United States [Member]	Dec. 31, 2012 Successor [Member] United States [Member]	Dec. 31, 2011 Successor [Member] United States [Member]	Dec. 31, 2010 Successor [Member] Canada [Member]	Dec. 31, 2012 Successor [Member] Canada [Member]	Dec. 31, 2011 Successor [Member] Canada [Member]	Dec. 31, 2010 Successor [Member] Mexico [Member]	Dec. 31, 2012 Successor [Member] Mexico [Member]	Dec. 31, 2011 Successor [Member] Mexico [Member]	Dec. 31, 2010 Successor [Member] Eliminations [Member]	Dec. 31, 2012 Successor [Member] Eliminations [Member]	Dec. 31, 2011 Successor [Member] Eliminations [Member]	Feb. 26, 2010 Predecessor [Member]	Feb. 26, 2010 Predecessor [Member] Wheels [Member]	Feb. 26, 2010 Predecessor [Member] Wheel end components and assemblies [Member]	Feb. 26, 2010 Predecessor [Member] Truck body and chassis parts [Member]	Feb. 26, 2010 Predecessor [Member] Ductile and gray iron castings [Member]	Feb. 26, 2010 Predecessor [Member] Customer One [Member]	Feb. 26, 2010 Predecessor [Member] Customer Two [Member]	Feb. 26, 2010 Predecessor [Member] Customer Three [Member]	Feb. 26, 2010 Predecessor [Member] United States [Member]	Feb. 26, 2010 Predecessor [Member] Canada [Member]	Feb. 26, 2010 Predecessor [Member] Mexico [Member]	Feb. 26, 2010 Predecessor [Member] Eliminations [Member]	Dec. 31, 2012 Wheels [Member]	Dec. 31, 2011 Wheels [Member]	Dec. 31, 2010 Wheels [Member] Successor [Member]	Dec. 31, 2012 Wheels [Member] Successor [Member]	Dec. 31, 2011 Wheels [Member] Successor [Member]	Feb. 26, 2010 Wheels [Member] Predecessor [Member]	Dec. 31, 2012 Gunite [Member]	Dec. 31, 2011 Gunite [Member]	Dec. 31, 2010 Gunite [Member] Successor [Member]	Dec. 31, 2012 Gunite [Member] Successor [Member]	Dec. 31, 2011 Gunite [Member] Successor [Member]	Feb. 26, 2010 Gunite [Member] Predecessor [Member]	Dec. 31, 2012 Brillion Iron Works [Member]	Dec. 31, 2011 Brillion Iron Works [Member]	Dec. 31, 2010 Brillion Iron Works [Member] Successor [Member]	Dec. 31, 2012 Brillion Iron Works [Member] Successor [Member]	Dec. 31, 2011 Brillion Iron Works [Member] Successor [Member]	Feb. 26, 2010 Brillion Iron Works [Member] Predecessor [Member]	Dec. 31, 2012 Imperial Group [Member]	Dec. 31, 2011 Imperial Group [Member]	Dec. 31, 2010 Imperial Group [Member] Successor [Member]	Dec. 31, 2012 Imperial Group [Member] Successor [Member]	Dec. 31, 2011 Imperial Group [Member] Successor [Member]	Feb. 26, 2010 Imperial Group [Member] Predecessor [Member]	Dec. 31, 2012 Corporate / Other [Member]	Dec. 31, 2011 Corporate / Other [Member]	Dec. 31, 2010 Corporate / Other [Member] Successor [Member]	Dec. 31, 2012 Corporate / Other [Member] Successor [Member]	Dec. 31, 2011 Corporate / Other [Member] Successor [Member]	Feb. 26, 2010 Corporate / Other [Member] Predecessor [Member]
Net sales and operating income by segment [Abstract]
Net sales	$ 176,259,000	$ 215,211,000	$ 268,783,000	$ 269,518,000	$ 242,499,000	$ 240,829,000	$ 241,872,000	$ 210,895,000	$ 929,771,000	$ 936,095,000	$ 582,307,000	$ 929,771,000	$ 936,095,000	$ 247,673,000	$ 414,340,000	$ 406,587,000	$ 175,352,000	$ 221,974,000	$ 251,113,000	$ 90,492,000	$ 135,137,000	$ 146,837,000	$ 68,790,000	$ 158,320,000	$ 131,558,000										$ 527,789,000	$ 905,596,000	$ 912,938,000	$ 3,016,000	$ 14,000	$ 1,948,000	$ 51,502,000	$ 24,161,000	$ 21,209,000	$ 0	$ 0	$ 0	$ 91,647,000	$ 38,379,000	$ 29,804,000	$ 11,442,000	$ 12,022,000				$ 82,104,000	$ 376,000	$ 9,167,000	$ 0			$ 247,673,000	$ 414,340,000	$ 406,587,000	$ 38,379,000			$ 175,352,000	$ 221,974,000	$ 251,113,000	$ 29,804,000			$ 90,492,000	$ 158,320,000	$ 146,837,000	$ 11,442,000			$ 68,790,000	$ 135,137,000	$ 131,558,000	$ 12,022,000
Operating income (loss)	(150,440,000)	(9,679,000)	9,592,000	7,236,000	9,520,000	4,491,000	8,460,000	1,441,000	(143,291,000)	23,912,000	(13,699,000)	(143,291,000)	23,912,000																																		(4,229,000)														23,577,000	44,928,000	57,864,000	2,663,000			2,623,000	(151,940,000)	(1,785,000)	277,000			(1,171,000)	11,969,000	2,301,000	(986,000)			(579,000)	(4,161,000)	3,141,000	(1,011,000)			(38,149,000)	(44,087,000)	(37,609,000)	(5,172,000)
Inter-segment sales											21,608,000	26,405,000	33,425,000																																		2,942,000
Net interest expense, other income (loss) and restructuring items											(122,000,000)	(33,500,000)	(30,500,000)																																		(52,400,000)
Reconciliation of assets by segment [Abstract]
Total assets	677,816,000				868,862,000				677,816,000	868,862,000																																																	486,118,000	509,829,000					54,707,000	188,053,000					51,435,000	63,216,000					49,189,000	43,581,000					36,367,000	64,183,000
Net sales [Abstract]
Sales to unaffiliated customers-domestic											508,508,000	813,068,000	799,942,000																						472,999,000	790,200,000	777,830,000	3,016,000	14,000	1,948,000	32,493,000	22,854,000	20,164,000	0	0	0	79,526,000								73,913,000	376,000	5,237,000	0
Sales to unaffiliated customers-export											73,799,000	116,703,000	136,153,000																						54,790,000	115,396,000	135,108,000	0	0	0	19,009,000	1,307,000	1,045,000	0	0	0	12,121,000								8,191,000	0	3,930,000	0
Total	176,259,000	215,211,000	268,783,000	269,518,000	242,499,000	240,829,000	241,872,000	210,895,000	929,771,000	936,095,000	582,307,000	929,771,000	936,095,000	247,673,000	414,340,000	406,587,000	175,352,000	221,974,000	251,113,000	90,492,000	135,137,000	146,837,000	68,790,000	158,320,000	131,558,000										527,789,000	905,596,000	912,938,000	3,016,000	14,000	1,948,000	51,502,000	24,161,000	21,209,000	0	0	0	91,647,000	38,379,000	29,804,000	11,442,000	12,022,000				82,104,000	376,000	9,167,000	0			247,673,000	414,340,000	406,587,000	38,379,000			175,352,000	221,974,000	251,113,000	29,804,000			90,492,000	158,320,000	146,837,000	11,442,000			68,790,000	135,137,000	131,558,000	12,022,000
Long-lived assets											645,546,000	515,102,000	628,713,000																						908,043,000	816,599,000	930,154,000	42,856,000	26,880,000	37,119,000	22,155,000	11,335,000	10,062,000	(327,508,000)	(339,712,000)	(348,622,000)
Schedule Of Revenue By Major Customers By Reporting Segments [Abstract]
Number of major customers									3
Minimum percentage of sales for major customer (in hundredths)									10.00%
Revenue, Major Customer [Line Items]
Amount											259,362,000	408,040,000	427,836,000													104,732,000	174,208,000	165,351,000	86,838,000	123,459,000	155,256,000	67,792,000	110,373,000	107,229,000													45,511,000					20,248,000	14,996,000	10,267,000
% of Sales (in hundredths)											44.50%	43.90%	45.70%													18.00%	18.70%	17.70%	14.90%	13.30%	16.60%	11.60%	11.90%	11.40%													49.70%					22.10%	16.40%	11.20%
Sales by product grouping [Abstract]
Net sales	$ 176,259,000	$ 215,211,000	$ 268,783,000	$ 269,518,000	$ 242,499,000	$ 240,829,000	$ 241,872,000	$ 210,895,000	$ 929,771,000	$ 936,095,000	$ 582,307,000	$ 929,771,000	$ 936,095,000	$ 247,673,000	$ 414,340,000	$ 406,587,000	$ 175,352,000	$ 221,974,000	$ 251,113,000	$ 90,492,000	$ 135,137,000	$ 146,837,000	$ 68,790,000	$ 158,320,000	$ 131,558,000										$ 527,789,000	$ 905,596,000	$ 912,938,000	$ 3,016,000	$ 14,000	$ 1,948,000	$ 51,502,000	$ 24,161,000	$ 21,209,000	$ 0	$ 0	$ 0	$ 91,647,000	$ 38,379,000	$ 29,804,000	$ 11,442,000	$ 12,022,000				$ 82,104,000	$ 376,000	$ 9,167,000	$ 0			$ 247,673,000	$ 414,340,000	$ 406,587,000	$ 38,379,000			$ 175,352,000	$ 221,974,000	$ 251,113,000	$ 29,804,000			$ 90,492,000	$ 158,320,000	$ 146,837,000	$ 11,442,000			$ 68,790,000	$ 135,137,000	$ 131,558,000	$ 12,022,000
% Of Sales (in hundredths)											100.00%	100.00%	100.00%	42.50%	45.00%	43.40%	30.10%	24.00%	26.80%	15.60%	14.00%	15.70%	11.80%	17.00%	14.10%																						100.00%	41.90%	32.50%	12.50%	13.10%