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Notes Receivable - Loans Receivable on Real Estate (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Mortgage Loans On Real Estate [Abstract]
Balance at January 1	$ 60,378	$ 84,541
Additions:
New mortgage loans	13,531	246
Interest	82	787
Accretion of discount	431	407
Deductions:
Payments of principal and interest	(11,560)	0
Other	0	(31,700)
Balance at June 30	$ 62,862	$ 54,281

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Mortgage loans on real estate accretion of discount.

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Mortgage loans on real estate interest.

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Payments of principal and interest.

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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

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-Section S99

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

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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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-Publisher FASB

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