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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Significant Accounting Policies [Line Items] |  |  |
Total real estate assets, net | $ 8,401,082,000 | $ 6,968,394,000 |
Mortgage and other secured indebtedness | 1,761,421,000 | 1,274,141,000 |
Other real estate liabilities | 415,413,000 | 326,024,000 |
Deconsolidation Gain Or Loss Amounts | 0 | 0 | 4,716,000
Retained interest in joint venture investment subsequent to deconsolidation |  |  | 0
Capitalized costs | 10,900,000 | 10,500,000 | 9,100,000
Aggregated liability of below-market leases | 123,900,000 | 50,400,000 |
Aggregated asset of above-market leases | 41,500,000 | 17,700,000 |
Future Amortization income, 2014 | 100,000 |  |
Future Amortization income, 2015 | 1,000,000 |  |
Future Amortization income, 2016 | 2,400,000 |  |
Future Amortization income, 2017 | 3,700,000 |  |
Future Amortization income, 2018 | 5,300,000 |  |
Impairment charges related to consolidated real estate investment | 72,600,000 | 126,500,000 | 125,900,000
Interest paid | 218,400,000 | 209,300,000 | 218,600,000
Capitalized interest paid | 8,800,000 | 13,300,000 | 12,700,000
Impairment of joint venture investments | 980,000 | 26,671,000 | 2,921,000
Accounts receivable, unrecoverable amount | 10,000,000 | 10,800,000 |
Allowance for straight line rent | 3,900,000 | 3,600,000 |
Straight line rent receivable, net | 61,900,000 | 58,200,000 |
Stock-based compensation cost recognized by the company | 7,400,000 | 6,400,000 | 6,800,000
Accelerated vesting of awards due to employee severance charges | 100,000 | 200,000 | 1,600,000
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Total real estate assets, net | 185,600,000 | 184,600,000 |
Mortgage and other secured indebtedness | 19,000,000 | 21,500,000 |
Other real estate liabilities | $ 2,400,000 | $ 1,900,000 |

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