Property on Operating Lease (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended					6 Months Ended
Jun. 30, 2012	Jun. 30, 2012 Containers	Jun. 30, 2012 Transportation, rail	Jun. 30, 2012 Marine vessel	Dec. 31, 2011 Marine vessel	Jun. 30, 2012 Other	Dec. 31, 2011 Other	Jun. 30, 2012 Total Property Subject To Or Available For Operating Lease	Jun. 30, 2012 Accumulated depreciation
Property Subject to or Available for Operating Lease [Line Items]
Balance December 31, 2011	$ 7,867	$ 19,678	$ 16,316	$ 4,793	$ 4,793	$ 640	$ 640	$ 41,427	$ (33,560)
Additions	(571)								(571)
Reclassifications or Dispositions	(832)	(170)	(4,318)					(4,488)	3,656
Balance June 30, 2012	$ 6,464	$ 19,508	$ 11,998	$ 4,793	$ 4,793	$ 640	$ 640	$ 36,939	$ (30,475)

The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph b(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 19

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant