Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2011
Other income and expenses:
Unrealized gain on derivative instrument attributable to noncontrolling interest	$ 1,674,706	$ 1,442,754

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avi_UnrealizedGainOnDerivativeInstrumentAttributableToNonControllingInterests

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duration