Summary of Significant Accounting Policies (Details) (USD $)	1 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Significant Accounting Policies (Textual) [Abstract]
Authorized amount from board of directors for share repurchase	$ 200,000,000
Share repurchase program effective date - current plan	Oct. 01, 2012
Share repurchase program expiry date - current plan	Dec. 31, 2014
Stock repurchase program expiry date - expired plan		Sep. 30, 2012
Number of shares repurchased		1,834,221
Cost of shares repurchased		45,200,000
Reclassification of purchase of additional interest in TRIP Holdings			15,500,000	(37,600,000)
Likelihood threshold for recognition of uncertain tax positions		50.00%
Net book value of intangible assets		$ 21,700,000
Minimum
Summary of Significant Accounting Policies (Textual) [Abstract]
Product warranty period against materials and manufacturing defects		1 year
Maximum
Summary of Significant Accounting Policies (Textual) [Abstract]
Product warranty period against materials and manufacturing defects		5 years
Buildings and improvements | Minimum
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life		3 years
Buildings and improvements | Maximum
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life		30 years
Leasehold improvements | Maximum
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life		7 years
Machinery and equipment | Minimum
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life		2 years
Machinery and equipment | Maximum
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life		10 years
Information systems hardware and software | Minimum
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life		2 years
Information systems hardware and software | Maximum
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life		5 years
Railcars in lease fleet
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful life		35 years
Customer receivables concentration | Customer receivables concentration | Energy Equipment Group
Summary of Significant Accounting Policies (Textual) [Abstract]
Number of customers for net receivables concentration		1
Net receivables percentage		21.00%