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Income Taxes - Narrative (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes:
Income tax expense for income and the portion of earnings retained based on Section 162(m) limitations	$ 10.6	$ 12.8	$ 32.7	$ 32.4
Years federal and state tax returns remain open for examination			2009, 2010 and 2011
Real Estate Investment Trust [Member]
Income Taxes:
Income tax expense for income and the portion of earnings retained based on Section 162(m) limitations	$ 3.3	$ 2.6	$ 9.3	$ 9.4

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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