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Related-Party Transactions - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Sep. 18, 2018
Jan. 31, 2018
Jan. 23, 2018
Mar. 31, 2019
Dec. 31, 2017
May 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]                  
Payment of underwriting fees             $ 0 $ 8,205 $ 0
Principal Owner | Goldman                  
Related Party Transaction [Line Items]                  
Payment of underwriting fees $ 5,000     $ 2,600          
Principal Owner | Goldman | 2018 Senior Unsecured Credit Facilities | Credit Facility                  
Related Party Transaction [Line Items]                  
Commitments from lending group under credit facility             $ 90,000    
Commitments from lending group under credit facility, percentage             7.10%    
Principal Owner | Affiliate of Goldman | Australia Term Loan | Term Loans                  
Related Party Transaction [Line Items]                  
Lender participation in loans, percentage             2.50%    
Principal Owner | Affiliate of Goldman | New Zealand Term Loan | Term Loans                  
Related Party Transaction [Line Items]                  
Lender participation in loans, percentage             31.80%    
IPO                  
Related Party Transaction [Line Items]                  
Number of shares sold (in shares)     33,350,000            
Payment of underwriting fees     $ 40,000            
IPO | Principal Owner | Goldman                  
Related Party Transaction [Line Items]                  
Refunds of underwriter's discount     $ 1,600            
IPO - Shares From Goldman | Principal Owner                  
Related Party Transaction [Line Items]                  
Number of shares sold (in shares)   5,163,716              
Ownership percentage after sale of stock     16.70%            
Public Stock Offering - Goldman Sachs                  
Related Party Transaction [Line Items]                  
Number of shares sold (in shares) 9,100,000     8,061,228          
Public Stock Offering - Goldman Sachs | Principal Owner                  
Related Party Transaction [Line Items]                  
Number of shares sold (in shares) 9,083,280     8,061,228          
Ownership percentage after sale of stock 9.90%                
Public Stock Offering - Goldman Sachs | Principal Owner | Goldman                  
Related Party Transaction [Line Items]                  
Refunds of underwriter's discount $ 700                
Interest and Fees | Principal Owner | Goldman                  
Related Party Transaction [Line Items]                  
Related party transaction           $ 15,200 $ 1,400 2,300 900
Interest Rate Swap Agreements | Principal Owner | Goldman | Australia Term Loan | Term Loans                  
Related Party Transaction [Line Items]                  
Related party transaction               1,200 $ 1,500
Interest Rate Swap Agreements | Interest Rate Swap | Principal Owner | Goldman | Senior Secured Term Loan A Facility | Term Loans                  
Related Party Transaction [Line Items]                  
Related party transaction             $ 200    
Swap Termination Fee | Principal Owner | Goldman                  
Related Party Transaction [Line Items]                  
Related party transaction               $ 1,800  
Escrow Prepayment | Principal Owner | 2018 Senior Unsecured Credit Facilities | Term Loans and Credit Facility                  
Related Party Transaction [Line Items]                  
Related party transaction         $ 200        
Common Stock                  
Related Party Transaction [Line Items]                  
Shares converted (in shares)     33,240,258         33,240,258  
Common Stock | Goldman                  
Related Party Transaction [Line Items]                  
Shares converted (in shares)     28,808,224            
Common Stock | Principal Owner | Goldman                  
Related Party Transaction [Line Items]                  
Shares converted (in shares)   28,808,224