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Fair Value of Financial Instruments - Summary of Fair Value Information of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2013
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Dec. 31, 2012
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||
| Interest and rent receivables | $ 49,838 | $ 45,289 | ||||
| Loans | 333,403 | [1] | 334,693 | [1] | ||
| Debt, net | (900,133) | (1,025,160) | ||||
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Estimate of Fair Value, Fair Value Disclosure
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||
| Interest and rent receivables | 38,650 | 36,700 | ||||
| Loans | 333,176 | [1] | 335,595 | [1] | ||
| Debt, net | $ (960,354) | $ (1,082,333) | ||||
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