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Notes Receivable - Loans Receivable on Real Estate (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Mortgage Loans On Real Estate [Abstract]
Balance at January 1	$ 60,378	$ 84,541
Additions:
New mortgage loans	21,967	592
Interest	319	790
Accretion of discount	651	615
Deductions:
Payments of principal and interest	(11,670)	0
Other	0	(31,700)
Balance at September 30	$ 71,645	$ 54,838

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Mortgage loans on real estate interest.

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Payments of principal and interest.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time.

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

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

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The amount of reductions in principal on mortgage loans other than foreclosures, costs of mortgages sold, and amortization of premium during the reporting period.

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