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Revolving Credit Facilities, Term Loans, Mortgages Payable and Scheduled Principal Repayments - Information Regarding Company's Revolving Credit Facilities, Term Loans and Mortgages Payable (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Unsecured term loan $ 350,000 $ 350,000
Secured term loan 400,000 400,000
Secured debt 1,761,421 1,274,141
Mortgage, Weighted Average Interest Rate 5.30% 5.80%
Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities LLC [Member]
   
Debt Instrument [Line Items]    
Carrying Value 29,100 117,900
Weighted average interest rate 2.20% 2.20%
Maturity Date April 2017  
Unsecured revolving credit facility with PNC Bank National Association [Member]
   
Debt Instrument [Line Items]    
Carrying Value 0 30,000
Weighted average interest rate    1.90%
Maturity Date April 2017  
Unsecured Term Loan - Tranche 1 [Member]
   
Debt Instrument [Line Items]    
Unsecured term loan 50,000 50,000
Term Loan 2.10% 2.30%
Term loan maturity date January 2017  
Unsecured Term Loan- Tranche 2 [Member]
   
Debt Instrument [Line Items]    
Unsecured term loan 300,000 300,000
Term Loan 3.20% 3.40%
Term loan maturity date January 2019  
Secured Term Loan with Key Bank National Association [Member]
   
Debt Instrument [Line Items]    
Secured term loan 400,000 400,000
Term Loan 1.80% 2.20%
Term loan maturity date April 2017  
Mortgage indebtedness-Fixed Rate [Member]
   
Debt Instrument [Line Items]    
Secured debt 1,663,700 1,187,900
Mortgage, Weighted Average Interest Rate 5.20% 4.90%
Mortgage Maturity Date, Start April 2014  
Mortgage Maturity Date, End February 2022  
Mortgage indebtedness-Variable Rate [Member]
   
Debt Instrument [Line Items]    
Secured debt $ 97,700 $ 86,200
Mortgage, Weighted Average Interest Rate 1.80% 1.70%
Mortgage Maturity Date, Start January 2015  
Mortgage Maturity Date, End December 2037