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Basis of Presentation - (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013 Sinotrak
Variable Interest Entity [Line Items]
Ownership interest in joint venture, (as a percent)			49.00%
Stockholders' equity attributable to noncontrolling interest	$ 982	$ 989

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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