Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Sep. 30, 2011 Railcar	Mar. 31, 2012
Contingencies (Textual) [Abstract]
Inspection cycle for tank cars in service minimum		3 years
Inspection cycle for tank cars in service maximum		5 years
Minimum possible loss		$ 4.3
Maximum possible loss		20.5
Total Accruals		9.3
Reserve for probable and estimable liabilities with respect to the investigations, assessments and remedial responses		$ 6.8
Number of tank cars voluntarily recertified by Company	948