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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Reconciliation [Line Items]
Income taxes computed at the federal statutory rate	$ 57,269	$ 37,171	$ 44,414
Benefit of REIT status	(57,268)	(37,183)	(44,437)
Income taxes computed on income of Capstead's sole taxable REIT subsidiary	1	(12)	(23)
Change in net deferred income tax assets	(1)	22	23
Other		(10)
Income tax provision

- 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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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

+ References+ Details