Gain Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014 item
Gain Contingencies [Line Items]
Gain contingency, number of vessels	3
Gain contingency, unrecorded amount	$ 2,800
Gain contingency, percentage of gross proceeds	10.00%
ATEL Capital Equipment Fund VIII, LLC [Member]
Gain Contingencies [Line Items]
Gain contingency, unrecorded amount	$ 350