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Schedule IV - Mortgage Loans on Real Estate - Summary of Changes in Carrying Amounts of Mortgage Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]
Balance at beginning of year	$ 258,092	$ 168,680
New mortgage loans	159,465	98,936
Collections of principal	(31,408)	(9,524)
Discount accretion	3,018
Balance at the close of year		$ 258,092

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Mortgage Loans On Real Estate Accretion Of Discount

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Total carrying amount of mortgage loans as of the balance sheet date.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

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The amount of principal collected on mortgage loans on real estate during the reporting period.

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Total amount of new mortgage loans on real estate during the reporting period.

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