Contingencies (Detail) (USD $)		0 Months Ended			3 Months Ended	0 Months Ended
	Sep. 30, 2012	Oct. 18, 2011 AUS Against Benz Air [Member]	Jul. 29, 2011 AUS Against Benz Air [Member]	Jan. 16, 2009 AUS Against Benz Air [Member]	Dec. 31, 2011 AUS Against Benz Air [Member]	Nov. 17, 2008 Cross Complaint Benz Air Against AUS [Member]	Jul. 31, 2011 Global Settlement Agreement [Member]
Loss Contingency, Damages Sought, Value				$ 200,000		$ 300,000
Loss Contingency, Damages Awarded, Value			200,000
Loss Contingency, Damages Awarded, Additional Value			300,000
Loss Contingency, Damages Awarded, Overturned, Value		300,000
Loss Contingency, Damages Awarded, Attorney's fees,Value		500,000
Gain (Loss) Related to Litigation Settlement					200,000
Loss Contingency, Settlement Agreement, Consideration							175,000
Loss Contingency, Settlement Agreement, Individual Consideration							25,000
Loss Contingency, Range of Possible Loss, Minimum	0
Loss Contingency, Range of Possible Loss, Maximum	$ 1,300,000