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Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2011	Mar. 31, 2012 Unaudited
Cost of investments in investment funds	$ 24,538,203	$ 24,242,371

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Name:	aspen_InvestmentFundsCost
Namespace Prefix:	aspen_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant