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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Significant Accounting Policies [Line Items] |  |  |
Total real estate assets, net | $ 6,968,394,000 | $ 6,719,063,000 |
Deconsolidation Gain Or Loss Amounts |  | 4,700,000 | 5,600,000
Retained interest in joint venture investment subsequent to deconsolidation |  | 0 |
Capitalized costs | 10,500,000 | 9,100,000 | 9,700,000
Aggregated liability of below-market leases | 50,400,000 | 29,500,000 |
Aggregated asset of above-market leases | 17,700,000 | 2,800,000 |
Future Amortization income, 2013 | 100,000 |  |
Future Amortization income, 2014 | 500,000 |  |
Future Amortization income, 2015 | 700,000 |  |
Future Amortization income, 2016 | 1,400,000 |  |
Future Amortization income, 2017 | 2,100,000 |  |
Impairment charges related to consolidated real estate investment | 126,500,000 | 125,800,000 | 171,900,000
Interest paid | 209,300,000 | 218,600,000 | 221,500,000
Capitalized interest paid | 13,300,000 | 12,700,000 | 12,200,000
Impairment of joint venture investments | 26,671,000 | 2,921,000 | 227,000
Accounts receivable, unrecoverable amount | 10,800,000 | 19,300,000 |
Allowance for straight line rent | 3,600,000 | 3,200,000 |
Straight line rent receivable, net | 58,200,000 | 55,700,000 |
Valuation allowance |  |  | (58,300,000)
Stock-based compensation cost recognized by the company | 6,400,000 | 6,800,000 | 5,700,000
Accelerated vesting of awards due to employee severance charges | 200,000 | 1,600,000 | 400,000
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Total real estate assets, net | 184,600,000 | 289,500,000 |
Mortgages | 21,500,000 | 23,500,000 |
Other real estate liabilities | $ 1,900,000 | $ 28,700,000 |

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