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Debt Facilities - Term Loan Facility (Detail)
$ in Thousands
Jul. 31, 2018
USD ($)
Jul. 31, 2018
JPY (¥)
Jul. 26, 2018
JPY (¥)
Dec. 12, 2017
GBP (£)
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
JPY (¥)
Dec. 31, 2019
SEK (kr)
Dec. 31, 2018
USD ($)
Jul. 31, 2018
JPY (¥)
Dec. 12, 2017
USD ($)
Dec. 12, 2017
SEK (kr)
Short-term Debt [Line Items]                        
Long term debt, gross           $ 1,370,118     $ 1,388,524      
Revolving credit facility borrowings | Revolving credit facility borrowings                        
Short-term Debt [Line Items]                        
Line of credit outstanding       £ 500,000,000.0 £ 456,300,000 $ 877,000   kr 2,555,000,000.0     $ 997,100 kr 2,800,000,000.0
Repay percentage     5.00% 5.00%                
Debt weighted average interest rate         1.86% 1.86% 1.86% 1.86%        
Debt issuance costs, net           $ 1,700            
Unsecured debt | Revolving credit facility borrowings | JPY Term Loan                        
Short-term Debt [Line Items]                        
Debt issuance costs, net           3,200            
Aggregate principal debt amount issued $ 424,700   ¥ 47,500,000,000             ¥ 47,500,000,000    
Long term debt, gross           $ 410,100 ¥ 44,500,000,000          
Effective interest rate (percent)         1.74% 1.74% 1.74% 1.74%        
Unsecured debt | Revolving credit facility borrowings | Japanese Yen Term Loan                        
Short-term Debt [Line Items]                        
Repayment of debt $ 391,300 ¥ 43,800,000,000                    
Minimum | Revolving credit facility borrowings | Revolving credit facility borrowings                        
Short-term Debt [Line Items]                        
Variable rate (percent)     1.00% 1.00%                
Maximum | Revolving credit facility borrowings | Revolving credit facility borrowings                        
Short-term Debt [Line Items]                        
Variable rate (percent)     1.70% 1.70%