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Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Gain on Disposal of Discontinued Operations (Note 5), net of tax	$ 0	$ 0
Sales of Products	608,661	913,941
Net gain on sale of assets	5,837,607
Which was paid at closing
Sales of Products	8,345,793
Which will be received only if TDG achieves certain quarterly and annual revenue targets from sales of goods and services to military, defense and security organizations
Sales of Products	$ 2,500,000

Provision recognizing a loss (after tax benefit) for initial, or subsequent, write-down to fair value (less cost to sell) of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include the recognition of a (gain) (net of tax expense) for a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

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