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Senior Notes and Loans Payable - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2017
May 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 29, 2019
Debt Instrument [Line Items]              
Capitalization of deferred finance costs       $ 4,345,000 $ 2,424,000    
Accrued interest       11,952,000 12,572,000    
Borrowings from debt       400,000,000 125,000,000 $ 500,000,000  
Loans payable       250,000,000 0    
Outstanding letters of credit       32,600,000 31,800,000    
Interest incurred       89,691,000 91,631,000 $ 84,264,000  
Term loan facility              
Debt Instrument [Line Items]              
Amortization of deferred financing costs       6,300,000 8,000,000.0    
Senior Notes              
Debt Instrument [Line Items]              
Capitalization of deferred finance costs       11,100,000 14,600,000    
Accrued interest       $ 9,800,000 $ 11,500,000    
5.250% Senior Notes due June 1, 2027 | Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 300,000,000.0          
Interest rate on debt (percent)   5.25%   5.25% 5.25%    
Percentage of aggregate principal amount (percent)   100.00%          
Proceeds from issuance of debt note, net   $ 296,300,000          
4.875% Senior Notes due July 1, 2021 | Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount     $ 300,000,000.0        
Interest rate on debt (percent)     4.875% 4.875% 4.875%    
Percentage of aggregate principal amount (percent)     99.44%        
Proceeds from issuance of debt note, net     $ 293,900,000        
5.875% Senior Notes due June 15, 2024              
Debt Instrument [Line Items]              
Notes issue price as a percentage of principal amount       98.15%      
5.875% Senior Notes due June 15, 2024 | Senior Notes              
Debt Instrument [Line Items]              
Interest rate on debt (percent)       5.875% 5.875%    
Percentage of aggregate principal amount (percent)       100.00%      
Proceeds from issuance of senior notes       $ 861,300,000      
4.375% Senior Notes due June 15, 2019 | Senior Notes              
Debt Instrument [Line Items]              
Interest rate on debt (percent)       4.375% 4.375%    
Term loan facility | Term loan facility              
Debt Instrument [Line Items]              
Line of credit facility, current borrowing capacity       $ 250,000,000     $ 250,000,000
Borrowings from debt $ 250,000,000            
Loans payable       $ 250,000,000 $ 0    
Line of credit facility, interest rate at period end (percent)       3.29%      
Term loan facility | Term loan facility | Minimum              
Debt Instrument [Line Items]              
Debt instrument variable interest rate       1.10%      
Term loan facility | Term loan facility | Maximum              
Debt Instrument [Line Items]              
Debt instrument variable interest rate       1.85%      
Term Loan Facility and Revolving Credit Facility              
Debt Instrument [Line Items]              
Unsecured revolving credit facility             1,000,000,000
Unsecured revolving credit facility | Unsecured revolving credit facility              
Debt Instrument [Line Items]              
Capitalization of deferred finance costs       $ 4,300,000 2,400,000    
Accrued interest       1,200,000 402,000    
Line of credit facility, current borrowing capacity             600,000,000
Loans payable       $ 0 $ 0    
Unsecured revolving credit facility | Unsecured revolving credit facility | Minimum              
Debt Instrument [Line Items]              
Debt instrument variable interest rate       1.25%      
Unsecured revolving credit facility | Unsecured revolving credit facility | Maximum              
Debt Instrument [Line Items]              
Debt instrument variable interest rate       2.00%      
Letters of credit | Unsecured revolving credit facility              
Debt Instrument [Line Items]              
Unsecured revolving credit facility             $ 75,000,000