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COMMITMENTS AND CONTINGENCIES (Details Textual) (USD $) | 12 Months Ended
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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