Aggregate Amount of Future Lease Payments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Operating Leases
Six months ending December 31, 2012	$ 842
Year ending December 31, 2013	1,053
2014	670
2015	309
2016	179
2017	179
Thereafter	75
Operating Leases, Future Minimum Payments Receivable, Total	3,307
Direct Financing Leases
Six months ending December 31, 2012	80
Year ending December 31, 2013	48
2014
2015
2016
2017
Thereafter
Capital Leases, Future Minimum Payments Receivable, Total	128
Total
Six months ending December 31, 2012	922
Year ending December 31, 2013	1,101
2014	670
2015	309
2016	179
2017	179
Thereafter	75
Operating and Capital Leases, Future Minimum Payments, Receivable, Total	$ 3,435

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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