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Income Taxes - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Assets
Dec. 31, 2015
USD ($)
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      
Net payment $ 700,000 1,100,000 $ 700,000  
Puerto Rico [Member]        
Income Taxes [Line Items]        
Number of properties | Assets       14
Prepaid tax asset       $ 16,800,000
Number of properties sold | Assets     2  
Prepaid tax asset released     $ 1,400,000  
Valuation allowance change in period   $ 4,000,000.0 $ 10,800,000