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PROPERTY AND EQUIPMENT (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 96,608,000 us-gaap_PropertyPlantAndEquipmentGross | $ 95,180,000 us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation | (46,572,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (43,799,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property and equipment | 50,036,000 us-gaap_PropertyPlantAndEquipmentNet | 51,381,000 us-gaap_PropertyPlantAndEquipmentNet
Medical Equipment and Facilities [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 82,151,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_MedicalEquipmentAndFacilitiesMember | 86,712,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_MedicalEquipmentAndFacilitiesMember
Accumulated depreciation | (11,269,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_MedicalEquipmentAndFacilitiesMember | (9,858,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_MedicalEquipmentAndFacilitiesMember
Office Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 721,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OfficeEquipmentMember | 749,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OfficeEquipmentMember
Deposits and Construction in Progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 8,736,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_DepositsAndConstructionInProgressMember | 4,719,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_DepositsAndConstructionInProgressMember
Deposits Towards Purchase of Proton Beam Systems [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 5,000,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_DepositsTowardsPurchaseOfProtonBeamSystemsMember | $ 3,000,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ams_DepositsTowardsPurchaseOfProtonBeamSystemsMember

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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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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + 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 (b) -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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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