Summary of Significant Accounting Policies - Schedule of Revenue Earn from Rental Properties (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings (loss) from operating activities	$ (8,199)	$ 2,084	$ 9,128
Gains from dispositions of real estate	6,838	948	1,705
Earnings (loss) from discontinued operations	(1,361)	3,032	10,833
Segment, Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues from rental properties	5,485	10,178	10,172
Impairment charges	(7,614)	(4,322)
Other operating expenses	(6,070)	(3,772)	(1,044)
Earnings (loss) from operating activities	(8,199)	2,084	9,128
Gains from dispositions of real estate	6,838	948	1,705
Earnings (loss) from discontinued operations	$ (1,361)	$ 3,032	$ 10,833

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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- Definition

Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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