Organization - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended
Jul. 17, 2013
Property
Mar. 31, 2014
Property
Dec. 31, 2013
Property
Summary Of Business And Significant Accounting Policies [Line Items]      
Real estate properties and loans, gross   $ 7,383,475,000 [1] $ 7,235,732,000 [1]
Real estate assets held for sale   2,287 2,186
Gross investment in real estate, percentage   98.40%  
Number of owned real estate properties   2,142 2,041
Securing mortgage properties, percentage   1.60%  
Securing mortgage properties   145 145
Number of properties acquired 104    
Payments to acquire real estate   157,100,000  
Dispositions of real estate   3 [2]  
Proceeds from sale of real estate   $ 6,300,000  
General Partner
      
Summary Of Business And Significant Accounting Policies [Line Items]      
Percentage ownership of operating partnership   1.00%  
Limited Partner
      
Summary Of Business And Significant Accounting Policies [Line Items]      
Percentage ownership of operating partnership   99.00%  
[1] The dollar amount of investments includes the gross investment in land, buildings and lease intangibles, as adjusted for any impairment, related to properties owned and the carrying amount of loans receivable and real estate assets held under direct financing leases.
[2] The total accumulated depreciation and amortization associated with dispositions of real estate was $1.7 million for the three months ended March 31, 2014.