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Unsecured and Secured Indebtedness - Additional Information (Detail)
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Nov. 30, 2015
USD ($)
$ / Note
shares
Debt Instrument [Line Items]        
Senior notes, Weighted Average Interest Rate 4.90% 5.20%    
Senior notes issued which may not be redeemed prior to maturity $ 82,200,000      
Covenant terms The fixed-rate senior notes were issued pursuant to indentures that contain certain covenants, including limitation on incurrence of debt, maintenance of unencumbered real estate assets and debt service coverage. The covenants also require that the cumulative dividends declared or paid from December 31, 1993, through the end of the current period cannot exceed Funds From Operations (as defined in the agreement) plus an additional $20.0 million for the same period unless required to maintain REIT status.      
Covenant compliance At December 31, 2016 and 2015, the Company was in compliance with all of the financial and other covenants under the indentures.      
Total fees, excluding underwriting discounts, incurred for the issuance of senior notes $ 43,000 $ 4,605,000 $ 1,046,000  
Gross fees paid for revolving credit facilities and term loans 1,800,000 2,300,000 $ 1,900,000  
Mortgage Payable [Member]        
Debt Instrument [Line Items]        
Net book value of investments and real estate collateralizing mortgages payable $ 1,500,000,000      
Mortgage Payable [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate 3.40%      
Mortgage Payable [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate 9.80%      
Secured Term Loan with Key Bank National Association [Member]        
Debt Instrument [Line Items]        
Term loan maturity date 2017-04      
Extension maturity period P1Y      
Covenant compliance The Company was in compliance with these financial covenants at December 31, 2016 and 2015.      
Extended maturity date 2018-04      
LIBOR [Member] | Secured Term Loan with Key Bank National Association [Member]        
Debt Instrument [Line Items]        
Specified spread line of credit facility 1.35%      
Senior Notes [Member]        
Debt Instrument [Line Items]        
Total fees, excluding underwriting discounts, incurred for the issuance of senior notes   $ 2,000,000    
Senior Convertible Notes [Member]        
Debt Instrument [Line Items]        
Senior convertible notes aggregate principal amount outstanding at maturity       $ 350,000,000
Conversion price, common shares per 1000 principal amount of senior convertible notes | shares       9.0311
Principal amount of senior convertible notes | $ / Note       1,000
Conversion of convertible notes | shares       3,200,000
Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member]        
Debt Instrument [Line Items]        
Unsecured term loan $ 400,000,000      
Term loan maturity date 2017-04      
Accordion feature $ 600,000,000      
Extension maturity period with three one-year borrower options      
Covenant compliance Company was in compliance with these financial covenants at December 31, 2016 and 2015      
Unsecured Debt [Member] | LIBOR [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member]        
Debt Instrument [Line Items]        
Specified spread line of credit facility 1.10%