Investment in Equipment and Leases (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Leases Disclosure [Line Items]
Balance December 31, 2011	$ 7,549
Reclassifications & Additions/ Dispositions	(67)
Depreciation/ Amortization Expense or Amortization of Leases	(503)
Balance September 30, 2012	6,979
Operating Leases
Leases Disclosure [Line Items]
Balance December 31, 2011	7,075
Reclassifications & Additions/ Dispositions	(1,270)
Depreciation/ Amortization Expense or Amortization of Leases	(363)
Balance September 30, 2012	5,442
Direct Financing Leases
Leases Disclosure [Line Items]
Balance December 31, 2011	405
Reclassifications & Additions/ Dispositions	(10)
Depreciation/ Amortization Expense or Amortization of Leases	(140)
Balance September 30, 2012	255
Assets Held for Sale or Lease
Leases Disclosure [Line Items]
Balance December 31, 2011	69
Reclassifications & Additions/ Dispositions	1,213
Balance September 30, 2012	$ 1,282