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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]        
Percentage of distributed taxable income to qualify as a REIT   90.00%    
Number of years the Company distributed sufficient taxable income in order to meet REIT distribution requirements   3 years    
Number of subsequent taxable years   4 years    
Tax cost basis of assets $ 8,600,000,000 $ 8,700,000,000 $ 8,500,000,000 $ 8,600,000,000
Net refund recorded     500,000 2,100,000
Net payment   1,100,000    
Net deferred tax assets   81,500,000 57,600,000  
Net operating loss carryforwards   36,700,000    
Expiry of net operating loss carryforwards   2017 through 2032    
Tax restructuring of investments   10,900,000    
Puerto Rico loss carryforwards   30,000,000    
Impairment charge 19,300,000     19,300,000
Lease liability charge $ 3,000,000     $ 3,000,000
Term of cumulative pre-tax book loss       3 years
Puerto Rico [Member]
        
Income Taxes [Line Items]        
Term of cumulative pre-tax book loss   3 years