Fair Value Measurements - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
Oct. 31, 2009	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term on alliance agreement (years)	3 years
Other income related to contract termination		$ 800,000
Minimum discount rate		10.00%
Maximum discount rate		20.00%
Ceased covered airport parking lease term		7 years
Remaining lease period of released land lease		28 years
Future land lease payment ceased		4,200,000
Investment in real, carrying value			471,700,000
Investment in real, fair value		300,000	94,351,000
Impairment charge		2,551,000	377,270,000
Write off of note receivable			$ 100,000

Investment in real estate fair value disclosure.

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- Definition

Maximum discount rate.

+ References

No definition available.

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- Definition

Minimum discount rate.

+ References

No definition available.

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- Definition

Operating Leases Future Minimum Payments Ceased

+ References

No definition available.

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- Definition

Operation of Facility Cease Period

+ References

No definition available.

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- Definition

Remaining Lease Term

+ References

No definition available.

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- Definition

Term On Alliance Agreement

+ References

No definition available.

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- Definition

Write off of note receivable.

+ References

No definition available.

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- Definition

Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

+ References

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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 26

-Subparagraph b

-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.

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- Definition

Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(d))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph d

-Article 7

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