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Revolving Credit Facilities and Term Loans - Information Regarding Company's Revolving Credit Facilities and Term Loans (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities, LLC [Member]
Sep. 30, 2014
Unsecured revolving credit facility with PNC Bank National Association [Member]
Sep. 30, 2014
Unsecured Term Loan - Tranche 1 [Member]
Sep. 30, 2014
Unsecured Term Loan- Tranche 2 [Member]
Sep. 30, 2014
Secured Term Loan with Key Bank National Association [Member]
Debt Instrument [Line Items]              
Revolving credit facilities $ 23,457 $ 29,133 $ 23,500 $ 0      
Unsecured term loan 350,000 350,000     50,000 300,000  
Secured term loan $ 400,000 $ 400,000         $ 400,000
Weighted-Average Interest Rate     2.40%        
Term loan interest rates         2.10% 3.20% 1.60%
Lines of credit maturity date     April 2017 April 2017      
Term loan maturity date         January 2017 January 2019 April 2017