2.4.0.840402 - Disclosure - Investments in Equipment and Leases, Net (Investment in Leases) (Details)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$Duration_1_1_2013_To_6_30_2013http://www.sec.gov/CIK0001069152duration2013-01-01T00:00:002013-06-30T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3zzhjb_LeasesDisclosureLineItemszzhjb_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Leases Disclosure [Line Items]2false 4zzhjb_InvestmentInEquipmentAndLeaseszzhjb_falsedebitinstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse69590006959USD$falsetruefalsexbrli:monetaryItemTypemonetaryTangible assets that are currently under operating or direct financing leases, or held in inventory as available for sale or re-lease.No definition available.false2Balance December 31, 20123false 4zzhjb_InvestmentInEquipmentAndLeasesReclassificationsAdditionsAndDispositionszzhjb_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-201000-201USD$falsefalsefalsexbrli:monetaryItemTypemonetaryInvestment in Equipment and Leases Reclassifications Additions and DispositionsNo definition available.false2Reclassifications, Additions/ Dispositions4false 4zzhjb_InvestmentInEquipmentAndLeasesDepreciationAndAmortizationExpensezzhjb_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-424000-424USD$falsefalsefalsexbrli:monetaryItemTypemonetaryInvestment in Equipment and Leases Depreciation and Amortization ExpenseNo definition available.false2Depreciation/ Amortization Expense or Amortization of Leases5false 4zzhjb_InvestmentInEquipmentAndLeaseszzhjb_falsedebitinstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse63340006334USD$falsefalsefalsexbrli:monetaryItemTypemonetaryTangible assets that are currently under operating or direct financing leases, or held in inventory as available for sale or re-lease.No definition available.false2Balance June 30, 20136false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2false USDtruefalse$Duration_1_1_2013_To_6_30_2013_zzhjb_InvestmentInEquipmentAndLeasesByTypeAxis_zzhjb_OperatingLeasesMemberhttp://www.sec.gov/CIK0001069152duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseOperating Leases [Member]zzhjb_InvestmentInEquipmentAndLeasesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldizzhjb_OperatingLeasesMemberzzhjb_InvestmentInEquipmentAndLeasesByTypeAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Operating Leases [Member]7true 3zzhjb_LeasesDisclosureLineItemszzhjb_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Leases Disclosure [Line Items]8false 4zzhjb_InvestmentInEquipmentAndLeaseszzhjb_falsedebitinstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse62300006230USD$falsefalsefalsexbrli:monetaryItemTypemonetaryTangible assets that are currently under operating or direct financing leases, or held in inventory as available for sale or re-lease.No definition available.false2Balance December 31, 20129false 4zzhjb_InvestmentInEquipmentAndLeasesReclassificationsAdditionsAndDispositionszzhjb_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-825000-825USD$falsefalsefalsexbrli:monetaryItemTypemonetaryInvestment in Equipment and Leases Reclassifications Additions and DispositionsNo definition available.false2Reclassifications, Additions/ Dispositions10false 4zzhjb_InvestmentInEquipmentAndLeasesDepreciationAndAmortizationExpensezzhjb_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-338000-338USD$falsefalsefalsexbrli:monetaryItemTypemonetaryInvestment in Equipment and Leases Depreciation and Amortization ExpenseNo definition available.false2Depreciation/ Amortization Expense or Amortization of Leases11false 4zzhjb_InvestmentInEquipmentAndLeaseszzhjb_falsedebitinstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse50670005067USD$falsefalsefalsexbrli:monetaryItemTypemonetaryTangible assets that are currently under operating or direct financing leases, or held in inventory as available for sale or re-lease.No definition available.false2Balance June 30, 201312false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse3false USDtruefalse$Duration_1_1_2013_To_6_30_2013_zzhjb_InvestmentInEquipmentAndLeasesByTypeAxis_zzhjb_DirectFinancingLeasesMemberhttp://www.sec.gov/CIK0001069152duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseDirect Financing Leases [Member]zzhjb_InvestmentInEquipmentAndLeasesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldizzhjb_DirectFinancingLeasesMemberzzhjb_InvestmentInEquipmentAndLeasesByTypeAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Direct Financing Leases [Member]13true 3zzhjb_LeasesDisclosureLineItemszzhjb_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Leases Disclosure [Line Items]14false 4zzhjb_InvestmentInEquipmentAndLeaseszzhjb_falsedebitinstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse100000100USD$falsefalsefalsexbrli:monetaryItemTypemonetaryTangible assets that are currently under operating or direct financing leases, or held in inventory as available for sale or re-lease.No definition available.false2Balance December 31, 201215false 4zzhjb_InvestmentInEquipmentAndLeasesReclassificationsAdditionsAndDispositionszzhjb_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-42000-42USD$falsefalsefalsexbrli:monetaryItemTypemonetaryInvestment in Equipment and Leases Reclassifications Additions and DispositionsNo definition available.false2Reclassifications, Additions/ Dispositions16false 4zzhjb_InvestmentInEquipmentAndLeasesDepreciationAndAmortizationExpensezzhjb_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-48000-48USD$falsefalsefalsexbrli:monetaryItemTypemonetaryInvestment in Equipment and Leases Depreciation and Amortization ExpenseNo definition available.false2Depreciation/ Amortization Expense or Amortization of Leases17false 4zzhjb_InvestmentInEquipmentAndLeaseszzhjb_falsedebitinstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse1000010USD$falsefalsefalsexbrli:monetaryItemTypemonetaryTangible assets that are currently under operating or direct financing leases, or held in inventory as available for sale or re-lease.No definition available.false2Balance June 30, 201318false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse4false USDtruefalse$Duration_1_1_2013_To_6_30_2013_zzhjb_InvestmentInEquipmentAndLeasesByTypeAxis_zzhjb_AssetsHeldForSaleOrLeaseMemberhttp://www.sec.gov/CIK0001069152duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseAssets Held For Sale or Lease [Member]zzhjb_InvestmentInEquipmentAndLeasesByTypeAxisxbrldihttp://xbrl.org/2006/xbrldizzhjb_AssetsHeldForSaleOrLeaseMemberzzhjb_InvestmentInEquipmentAndLeasesByTypeAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Assets Held For Sale or Lease [Member]19true 3zzhjb_LeasesDisclosureLineItemszzhjb_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Leases Disclosure [Line Items]20false 4zzhjb_InvestmentInEquipmentAndLeaseszzhjb_falsedebitinstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse629000629USD$falsefalsefalsexbrli:monetaryItemTypemonetaryTangible assets that are currently under operating or direct financing leases, or held in inventory as available for sale or re-lease.No definition available.false2Balance December 31, 201221false 4zzhjb_InvestmentInEquipmentAndLeasesReclassificationsAdditionsAndDispositionszzhjb_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse666000666USD$falsefalsefalsexbrli:monetaryItemTypemonetaryInvestment in Equipment and Leases Reclassifications Additions and DispositionsNo definition available.false2Reclassifications, Additions/ Dispositions22false 4zzhjb_InvestmentInEquipmentAndLeasesDepreciationAndAmortizationExpensezzhjb_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-38000-38USD$falsefalsefalsexbrli:monetaryItemTypemonetaryInvestment in Equipment and Leases Depreciation and Amortization ExpenseNo definition available.false2Depreciation/ Amortization Expense or Amortization of Leases23false 4zzhjb_InvestmentInEquipmentAndLeaseszzhjb_falsedebitinstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse12570001257USD$falsetruefalsexbrli:monetaryItemTypemonetaryTangible assets that are currently under operating or direct financing leases, or held in inventory as available for sale or re-lease.No definition available.false2Balance June 30, 2013falseInvestments in Equipment and Leases, Net (Investment in Leases) (Details) (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.atel.com/20121231/role/DisclosureInvestmentsInEquipmentAndLeasesNetInvestmentInLeasesDetails123