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OBLIGATIONS UNDER CAPITAL LEASES (Details Textual) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Capital Lease Obligations [Line Items] |  |
Description of Lessee Leasing Arrangements, Capital Leases | payable in 60 to 84 monthly installments, and mature between July 2015 and May 2020. |
Maximum [Member] |  |
Capital Lease Obligations [Line Items] |  |
Capital Lease Obligation Interest Rate |  | 9.50%ams_CapitalLeaseObligationInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum [Member] |  |
Capital Lease Obligations [Line Items] |  |
Capital Lease Obligation Interest Rate | 5.15%ams_CapitalLeaseObligationInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember |
Nine Obligations [Member] |  |
Capital Lease Obligations [Line Items] |  |
Capital Lease Obligations | 18,279,000 us-gaap_CapitalLeaseObligations / us-gaap_FairValueByLiabilityClassAxis = ams_NineObligationsMember | 20,680,000 us-gaap_CapitalLeaseObligations / us-gaap_FairValueByLiabilityClassAxis = ams_NineObligationsMember

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- Definition Interest rate of capital lease obligation. + References No definition available. + Details
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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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- Definition A general description of the lessee's leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6394851&loc=SL2265659-115463 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 15 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6451445&loc=d3e32400-112679 + Details
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