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Gain Contingencies (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
item
Gain Contingencies [Line Items]  
Gain contingency, number of vessels 3zzhjb_GainContingencyNumberOfVessels
Gain contingency, unrecorded amount $ 2,800us-gaap_GainContingencyUnrecordedAmount
Gain contingency, percentage of gross proceeds 10.00%zzhjb_GainContingencyPercentageOfGrossProceeds
ATEL Capital Equipment Fund VIII, LLC [Member]  
Gain Contingencies [Line Items]  
Gain contingency, unrecorded amount $ 350us-gaap_GainContingencyUnrecordedAmount
/ dei_LegalEntityAxis
= zzhjb_CompanyMember