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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
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