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Revolving Credit Facilities and Term Loans - Information Regarding Company's Revolving Credit Facilities and Term Loans (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Unsecured revolving credit facility arranged by JP Morgan Securities, LLC and Wells Fargo Securities LLC [Member]
Mar. 31, 2014
Unsecured revolving credit facility with PNC Bank National Association [Member]
Mar. 31, 2014
Unsecured Term Loan - Tranche 1 [Member]
Mar. 31, 2014
Unsecured Term Loan- Tranche 2 [Member]
Mar. 31, 2014
Secured Term Loan with Key Bank National Association [Member]
Debt Instrument [Line Items]              
Carrying Value     $ 28,300,000 $ 0      
Weighted-Average Interest Rate     2.20%         
Lines of credit maturity date     April 2017 April 2017      
Unsecured term loan 350,000,000 350,000,000     50,000,000 300,000,000  
Term loan interest rates         2.10% 3.20% 1.80%
Term loan maturity date         January 2017 January 2019 April 2017
Secured term loan $ 400,000,000 $ 400,000,000         $ 400,000,000