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Income Taxes - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Assets
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Assets
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      
U.S. federal income taxes $ 0 $ 0 $ 0  
U.S. federal excise taxes $ 0 0 0  
Number of subsequent taxable years 4 years      
Tax cost basis of assets $ 5,000,000,000 9,100,000,000    
Net payment 1,100,000 700,000 $ 1,000,000  
Aggregate valuation allowance 11,400,000 61,000,000    
Puerto Rico [Member]        
Income Taxes [Line Items]        
Number of properties | Assets       14
Prepaid tax asset   $ 4,000,000   $ 16,800,000
Number of properties sold | Assets   2    
Prepaid tax asset released   $ 1,400,000    
Aggregate valuation allowance $ 4,000,000 $ 10,800,000