Goodwill and Other Intangible Assets (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Goodwill by reportable segment [Roll Forward]
Balance as of January 1, 2012	$ 163,536,000
Balance as of June 30, 2012	163,536,000
Other intangible assets by reportable segment [Roll Forward]
Balance as of January 1, 2012	181,349,000
Amortization	(5,391,000)	(6,765,000)
Balance as of June 30, 2012	175,958,000
Goodwill [Abstract]
Weighted Average Useful Lives	0 years
Gross Amount	163,536,000		163,536,000
Accumulated Amortization	0		0
Carrying Amount	163,536,000
Other intangible assets [Abstract]
Gross Amount	202,165,000		202,165,000
Accumulated Amortization	26,207,000		20,816,000
Carrying Amount	175,958,000
Amortization expense for other intangible assets, 2012	10,800,000
Amortization expense for other intangible assets, 2013	10,600,000
Amortization expense for other intangible assets, 2014	10,300,000
Amortization expense for other intangible assets, 2015	10,300,000
Amortization expense for other intangible assets, 2016	10,300,000
Non-compete agreements [Member]
Other intangible assets by reportable segment [Roll Forward]
Balance as of January 1, 2012	809,000
Balance as of June 30, 2012	553,000
Other intangible assets [Abstract]
Weighted Average Useful Lives	2 years
Gross Amount	1,023,000		1,023,000
Accumulated Amortization	470,000		214,000
Carrying Amount	553,000
Trade names [Member]
Other intangible assets by reportable segment [Roll Forward]
Balance as of January 1, 2012	33,200,000
Balance as of June 30, 2012	33,200,000
Other intangible assets [Abstract]
Weighted Average Useful Lives	0 years
Gross Amount	33,200,000		33,200,000
Accumulated Amortization	0		0
Carrying Amount	33,200,000
Technology [Member]
Other intangible assets by reportable segment [Roll Forward]
Balance as of January 1, 2012	31,601,000
Balance as of June 30, 2012	29,677,000
Other intangible assets [Abstract]
Weighted Average Useful Lives	10 years
Gross Amount	38,849,000		38,849,000
Accumulated Amortization	9,172,000		7,248,000
Carrying Amount	29,677,000
Customer relationships [Member]
Other intangible assets by reportable segment [Roll Forward]
Balance as of January 1, 2012	115,739,000
Balance as of June 30, 2012	112,528,000
Other intangible assets [Abstract]
Weighted Average Useful Lives	19 years 10 months 24 days
Gross Amount	129,093,000		129,093,000
Accumulated Amortization	16,565,000		13,354,000
Carrying Amount	112,528,000
Wheels [Member]
Goodwill by reportable segment [Roll Forward]
Balance as of January 1, 2012	96,283,000
Balance as of June 30, 2012	96,283,000
Other intangible assets by reportable segment [Roll Forward]
Balance as of January 1, 2012	138,575,000
Amortization	(3,953,000)
Balance as of June 30, 2012	134,622,000
Goodwill [Abstract]
Carrying Amount	96,283,000
Other intangible assets [Abstract]
Carrying Amount	134,622,000
Gunite [Member]
Goodwill by reportable segment [Roll Forward]
Balance as of January 1, 2012	62,839,000
Balance as of June 30, 2012	62,839,000
Other intangible assets by reportable segment [Roll Forward]
Balance as of January 1, 2012	38,968,000
Amortization	(1,100,000)
Balance as of June 30, 2012	37,868,000
Goodwill [Abstract]
Carrying Amount	62,839,000
Other intangible assets [Abstract]
Carrying Amount	37,868,000
Brillion Iron Works [Member]
Goodwill by reportable segment [Roll Forward]
Balance as of January 1, 2012	4,414,000
Balance as of June 30, 2012	4,414,000
Other intangible assets by reportable segment [Roll Forward]
Balance as of January 1, 2012	2,997,000
Amortization	(82,000)
Balance as of June 30, 2012	2,915,000
Goodwill [Abstract]
Carrying Amount	4,414,000
Other intangible assets [Abstract]
Carrying Amount	2,915,000
Corporate [Member]
Other intangible assets by reportable segment [Roll Forward]
Balance as of January 1, 2012	809,000
Amortization	(256,000)
Balance as of June 30, 2012	553,000
Other intangible assets [Abstract]
Carrying Amount	$ 553,000