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Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
Income tax expense for income and the portion of earnings retained based on 162(m) limitations	$ 44.1	$ 28.6	$ 24.7
Income tax expense - effective tax rate, percentage	52.00%	53.00%	52.00%
Federal, state, and city statutory corporate tax rate, percentage	45.00%
Years federal and state tax returns remain open for examination	2008, 2009 and 2010
Real Estate Investment Trust [Member]
Income Taxes [Line Items]
Income tax expense for income and the portion of earnings retained based on 162(m) limitations	$ 14.9	$ 6.8	$ 9.7
Maximum percentage of ordinary income that the combined statutory tax rate applies	10.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The component of income tax expense representing amounts paid or payable (or refundable) which are classified as "income taxes" as determined by applying the provisions of enacted tax law to other than the taxable Income or Loss from continuing operations for the period. Items affecting income taxes and required to be disclosed, but not included elsewhere, would also be designated as "Other".

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