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Revolving Credit Facilities, Term Loans, Mortgages Payable and Scheduled Principal Repayments - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Unsecured term loan $ 350,000,000 $ 350,000,000  
Net book value of investments and real estate collateralizing mortgages payable 3,100,000,000    
Fixed interest rates on mortgage payables, Minimum 3.375%    
Fixed interest rates on mortgage payables, Maximum 9.625%    
Gross fees paid for revolving credit facilities and term loans 3,200,000 3,000,000 4,000,000
Debt extinguishment costs   400,000 7,900,000
Mortgage Payable [Member]
     
Debt Instrument [Line Items]      
Fixed interest rates on mortgage payables, Minimum 3.40%    
Fixed interest rates on mortgage payables, Maximum 9.80%    
Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities LLC [Member]
     
Debt Instrument [Line Items]      
Unsecured revolving credit facility borrowing capacity 750,000,000    
Accordion feature 1,250,000,000    
Period agreement was last amended January 2013    
Extension maturity period 1 year    
Extended Maturity Date Apr. 30, 2018    
Line of credit facility competitive bid option on periodic interest rates Up to 50% of the facility    
Facility fee 0.20%    
Carrying Value 29,100,000 117,900,000  
Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities LLC [Member] | Euro-denominated borrowings [Member]
     
Debt Instrument [Line Items]      
Carrying Value 4,600,000    
Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities LLC [Member] | Canadian Dollar-Denominated Borrowings [Member]
     
Debt Instrument [Line Items]      
Carrying Value 24,500,000    
Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities LLC [Member] | US Dollar-Denominated Borrowings [Member]
     
Debt Instrument [Line Items]      
Carrying Value 0    
Unsecured revolving credit facility with PNC Bank National Association [Member]
     
Debt Instrument [Line Items]      
Period agreement was last amended January 2013    
Carrying Value 0 30,000,000  
Unsecured revolving credit facility 65,000,000    
Secured Term Loan with Key Bank National Association [Member]
     
Debt Instrument [Line Items]      
Period agreement was last amended January 2013    
Extension maturity period 1 year    
Extended Maturity Date Apr. 30, 2018    
Specified spread line of credit facility LIBOR rate 1.35%    
Covenant compliance The Company was in compliance with these covenants at December 31, 2013.    
Revolving Credit Facilities [Member]
     
Debt Instrument [Line Items]      
Specified spread line of credit facility LIBOR rate 1.15%    
Specified spread line of credit facility prime rate 0.15%    
Covenant terms The Company is required to comply with certain covenants under the Revolving Credit Facilities relating to total outstanding indebtedness, secured indebtedness, maintenance of unencumbered real estate assets and fixed charge coverage. The covenants also require that the Company cannot exceed a total dividend payout ratio of 95% of the Company's pro rata share of funds from operations (as defined in the agreement) for the prior twelve-month period unless required to maintain REIT status.    
Covenant compliance The Company was in compliance with these covenants at December 31, 2013.    
Unsecured Term Loan - Tranche 1 [Member]
     
Debt Instrument [Line Items]      
Specified spread line of credit facility LIBOR rate 1.50% 1.70%  
Covenant compliance The Company was in compliance with these covenants at December 31, 2013.    
Unsecured term loan 50,000,000 50,000,000  
Unsecured Term Loan- Tranche 2 [Member]
     
Debt Instrument [Line Items]      
Specified spread line of credit facility LIBOR rate 1.90% 2.10%  
Covenant compliance The Company was in compliance with these covenants at December 31, 2013.    
Unsecured term loan $ 300,000,000 $ 300,000,000