Aggregate Amount of Future Lease Payments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Operating Leases
Three months ending December 31, 2012	$ 470
Year ending December 31, 2013	1,353
2014	980
2015	465
2016	179
2017	179
Thereafter	75
Operating Leases, Future Minimum Payments Receivable, Total	3,701
Direct Financing Leases
Three months ending December 31, 2012	32
Year ending December 31, 2013	48
2014
2015
2016
2017
Thereafter
Capital Leases, Future Minimum Payments Receivable, Total	80
Total
Three months ending December 31, 2012	502
Year ending December 31, 2013	1,401
2014	980
2015	465
2016	179
2017	179
Thereafter	75
Operating and Capital Leases, Future Minimum Payments, Receivable, Total	$ 3,781

Amount of minimum lease payments to be received by the lessor for capital leases.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952072&loc=d3e45377-112738

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph a(i)(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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.