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Equity Based Compensation - 2018 Incentive Plan - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jun. 25, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
General and Administrative Expense          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Compensation expense   $ 0.2 $ 0.2 $ 0.5 $ 0.6
2018 Equity Incentive Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Maximum number of shares issuable under plan   3,550,000   3,550,000  
2018 Equity Incentive Plan | Restricted Stock Awards          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares issued       691,290  
Grant date fair value of common stock awards per share       $ 13.68  
Unrecognized compensation cost   $ 8.6   $ 8.6  
Unrecognized compensation cost, weighted average recognition period       2 years 8 months 12 days  
2018 Equity Incentive Plan | Restricted Stock Awards | Distributions in Excess of Cumulative Earnings          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Dividends declared on unvested restricted common stock   0.2   $ 0.2  
2018 Equity Incentive Plan | Restricted Stock Awards | General and Administrative Expense          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Compensation expense   $ 0.8   $ 0.9  
2018 Equity Incentive Plan | Restricted Stock Awards | First Anniversary          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards expected to vest 15,484        
2018 Equity Incentive Plan | Restricted Stock Awards | First, Second and Third Anniversaries          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock awards expected to vest 675,806        
2018 Equity Incentive Plan | Restricted Stock Awards | Directors, Executive Officers and Other Employees          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares issued 691,290