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COMMITMENTS AND CONTINGENCIES (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012
Long-term Purchase Commitment, Amount	$ 48,195,000
Long-term Purchase Commitment Deposits for Future Purchase	$ 8,186,000

X

- Definition

Deposits for purchase of commitments in future.

+ References

No definition available.

+ Details

Name:	ams_LongTermPurchaseCommitmentDepositsForFuturePurchase
Namespace Prefix:	ams_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration