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PROPERTY AND EQUIPMENT (Details Textual) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Property, Plant and Equipment [Line Items] |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | $ 46,572,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | $ 43,799,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Medical Equipment and Facilities [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Capital Leased Assets, Gross | 29,548,000 us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_MedicalEquipmentAndFacilitiesMember | 30,538,000 us-gaap_CapitalLeasedAssetsGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_MedicalEquipmentAndFacilitiesMember
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 11,269,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_MedicalEquipmentAndFacilitiesMember | 9,858,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_MedicalEquipmentAndFacilitiesMember
Radiation Oncology Physician Group [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Long Term Purchase Commitment Deposits For Assets | 400,000 ams_LongTermPurchaseCommitmentDepositsForAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_RadiationOncologyPhysicianGroupMember |
Three Mevion S250 Proton Beam Radiation Therapy [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Long Term Purchase Commitment Deposits For Assets | $ 5,000,000 ams_LongTermPurchaseCommitmentDepositsForAssets / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_ThreeMevionS250ProtonBeamRadiationTherapyMember |

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- Definition Long term Purchase commitment deposits for the assets. + References No definition available. + Details
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Namespace Prefix: | ams_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ams_RadiationOncologyPhysicianGroupMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |