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Income Taxes - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
Assets
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
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    
U.S. federal excise taxes $ 0    
Number of subsequent taxable years 4 years    
Tax cost basis of assets $ 10,600,000,000 $ 10,600,000,000 $ 10,400,000,000
Net payment 1,500,000 1,600,000 1,900,000
Tax expense 6,286,000 1,855,000 $ 2,685,000
Net deferred tax assets 65,400,000 $ 84,500,000  
Net operating loss carryforwards $ 38,000,000    
Expiry of net operating loss carryforwards 2022 through 2035    
Puerto Rico Tax Restructuring [Member]      
Income Taxes [Line Items]      
Number of properties | Assets 14    
Prepay of taxes $ 20,200,000    
Taxable REIT subsidiary activity 16,800,000    
Tax expense $ 3,400,000    
Effective tax rate spread 2.00%    
Effective tax rate 12.00%    
Withholding tax rate 10.00%    
Effective tax rate on capital gains 12.00% 29.00%