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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Minimum annual distribution of adjusted taxable income for REIT qualification	90.00%
Basis of net assets for federal income tax purposes	$ 21,393
Income tax benefit	612	470	503
Net deferred tax assets	38,559	60,197
Federal statutory rate	35.00%	35.00%	35.00%
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits, increases resulting from prior period tax positions	$ 797	$ 797

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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