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Fair Value Disclosure of Financial Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Payable	$ 1,706,258,000	$ 1,649,755,000
Fixed Rate Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Payable	680,000,000	538,000,000
Notes Payable, fair value	723,000,000	560,000,000
Variable Rate Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Payable	1,027,000,000	1,112,000,000
Notes Payable, fair value	$ 956,000,000	$ 1,053,000,000

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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