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Mortgage Notes Payable (Narrative) (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
Montvale Center [Member]
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Jun. 30, 2012
Bay Colony Corporate Center [Member]
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Mar. 12, 2012
Bay Colony Corporate Center [Member]
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Jun. 30, 2012
One Freedom Square [Member]
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Apr. 02, 2012
One Freedom Square [Member]
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| Mortgage Notes Payable [Line Items] | ||||||||
| Debt default, accrued interest rate | 9.93% | |||||||
| Amount of debt extinguished | $ 25,000,000 | |||||||
| Maturity Date | Jun. 06, 2012 | Jun. 11, 2012 | Jun. 30, 2012 | |||||
| Gain on forgiveness of debt from discontinued operations | 17,807,000 | 17,807,000 | ||||||
| Repayments of mortgage notes payable | 219,865,000 | 468,639,000 | 143,900,000 | 65,100,000 | ||||
| Interest at a fixed rate | 6.53% | 7.75% | ||||||
| Penalty for early repayment of debt | 0 | 0 | ||||||
| Gains from early extinguishments of debt | $ 274,000 | $ 1,041,000 | $ 900,000 | $ 300,000 | ||||