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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Line Items]
REIT, minimum percentage of taxable income required to be distributed	90.00%
Expected net tax benefit	$ 137.7
Effective tax rate	8.00%	37.30%
Percentage of tax position benefit maximum than being realized upon ultimate settlement	50.00%

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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