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OBLIGATIONS UNDER CAPITAL LEASES (Details Textual) (USD $) | 12 Months Ended |  |  |
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Dec. 31, 2012 | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2011 Eleven Obligations [Member] | Dec. 31, 2012 Nine Obligations [Member]
Capital Lease Obligations |  |  |  | $ 26,184,000 | $ 23,133,000
Capital Lease Obligation, Interest Rate |  | 6.04% | 9.50% |  |
Capital Lease Obligation, Description | Payable in 60 to 84 monthly installments, and mature between June 2013 and December 2018. |  |  |  |

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- Definition Description of capital lease obligations. + References No definition available. + Details
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Namespace Prefix: | ams_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest rate of capital lease obligation. + References No definition available. + Details
Name: | ams_CapitalLeaseObligationInterestRate
Namespace Prefix: | ams_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant