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Indebtedness - Information Regarding Indebtedness (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Mortgage Loans Payable, Net $ 677,890 $ 763,616
Unamortized Premiums (115) (161)
Mortgage Loans Payable, Gross 677,775 763,455
Senior Unsecured Notes, Net 445,916 474,150
Unamortized Discounts 980 2,570
Senior Unsecured Notes, Gross 446,896 476,720
Unsecured Credit Facility 173,000 [1] 98,000 [1]
2016 Notes
    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 159,566 159,510
Interest Rate 5.75%  
Effective Interest Rate 5.91%  
Maturity Date Jan. 15, 2016  
2017 Notes
    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 54,960 55,385
Interest Rate 7.50%  
Effective Interest Rate 7.52%  
Maturity Date Dec. 01, 2017  
2027 Notes
    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 6,066 6,066
Interest Rate 7.15%  
Effective Interest Rate 7.11%  
Maturity Date May 15, 2027  
2028 Notes
    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 31,883 55,261
Interest Rate 7.60%  
Effective Interest Rate 8.13%  
Maturity Date Jul. 15, 2028  
2032 Notes
    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 10,514 11,500
Interest Rate 7.75%  
Effective Interest Rate 7.87%  
Maturity Date Apr. 15, 2032  
2014 Notes
    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net 81,149 79,683
Interest Rate 6.42%  
Effective Interest Rate 6.54%  
Maturity Date Jun. 01, 2014  
2017 II Notes
    
Debt Instrument [Line Items]    
Senior Unsecured Notes, Net $ 101,778 $ 106,745
Interest Rate 5.95%  
Effective Interest Rate 6.37%  
Maturity Date May 15, 2017  
Line of Credit
    
Debt Instrument [Line Items]    
Line of Credit Facility, Interest Rate at Period End 1.666% [1]  
Effective Interest Rate 1.666% [1]  
Maturity Date Sep. 29, 2017 [1]  
Mortgages [Member]
    
Debt Instrument [Line Items]    
Interest Rate, Minimum 4.03%  
Interest Rate, Maximum 8.26%  
Effective Interest Rate, Minimum 4.03%  
Effective Interest Rate, Maximum 8.26%  
Maturity Date Range, Start Oct. 01, 2014  
Maturity Date Range, End Sep. 01, 2022  
[1] * The maturity date may be extended an additional year at our election, subject to certain restrictions.