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STATEMENTS OF INCOME (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Stated earnings per participation unit	$ 5,000	$ 5,000
Participation units outstanding	720	720

X

- Definition

Participation units outstanding.

+ References

No definition available.

+ Details

Name:	westas_ParticipationUnitOutstanding
Namespace Prefix:	westas_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Stated value per participation unit

+ References

No definition available.

+ Details

Name:	westas_StatedValuePerParticipationUnit
Namespace Prefix:	westas_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant