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Stockholder Equity and Noncontrolling Interest - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Dec. 27, 2020
USD ($)
shares
Nov. 13, 2020
USD ($)
$ / shares
shares
Feb. 20, 2020
Agreement
$ / shares
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Class Of Stock [Line Items]              
At-the-market agreement to sell common shares, maximum offer price | $   $ 150,000,000          
Limited partnership interest received in exchange for issuance of common stock         196,974 9,616  
OP Units outstanding         674,517 871,491  
Common Shares              
Class Of Stock [Line Items]              
Common stock issued         10,350,000 1,717,291 2,196,164
Conversion of noncontrolling interest to common shares (in Shares)         196,974 9,616 2,130,244
Forward Sale Agreement              
Class Of Stock [Line Items]              
Common stock issued     10,350,000        
Number of agreements | Agreement     2        
Settlement value of shares | $ $ 98,775,000     $ 50,000,000      
Shares issued       3,406,000      
Settlement of remaining shares 6,944,000            
ATM Program              
Class Of Stock [Line Items]              
Expected settlement date of forward sales transaction   Dec. 21, 2021          
ATM Program | Forward Sale Transaction              
Class Of Stock [Line Items]              
Share price | $ / shares   $ 14.00          
Shares issued   900,000          
Proceeds from sale of stock upon settlement | $   $ 12,400,000          
Underwriting Agreement | BMO Capital Markets and Bank of Montreal              
Class Of Stock [Line Items]              
Common stock issued     10,350,000        
Share price | $ / shares     $ 14.688        
Underwriter's option to purchase additional shares     1,350,000