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Senior Notes and Loans Payable - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2017
May 31, 2016
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Mar. 29, 2019
Debt Instrument [Line Items]              
Repurchased principal       $ 10,000 $ 0    
Capitalization of deferred finance costs       5,298,000   $ 2,424,000  
Accrued interest       24,345,000   12,572,000  
Interest incurred       23,373,000 21,520,000    
Amortization of deferred financing costs       1,900,000 $ 2,000,000    
Senior Notes              
Debt Instrument [Line Items]              
Proceeds from issuance of senior notes, net       861,300,000      
Capitalization of deferred finance costs       13,400,000      
Accrued interest       $ 23,300,000   11,500,000  
5.250% Senior notes due June 1, 2027 | Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 300,000,000          
Interest rate on debt instrument (percent)   5.25%   5.25%      
Debt issuance, percentage of aggregate principal (percent)   100.00%          
Proceeds from issuance of senior notes, net   $ 296,300,000          
Maturity date of senior note       Jun. 01, 2027      
4.875% Senior notes due July 1, 2021 | Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount     $ 300,000,000        
Interest rate on debt instrument (percent)     4.875% 4.875%      
Debt issuance, percentage of aggregate principal (percent)     99.44%        
Proceeds from issuance of senior notes, net     $ 293,900,000        
Maturity date of senior note       Jul. 01, 2021      
4.375% Senior notes due June 15, 2019 | Senior Notes              
Debt Instrument [Line Items]              
Interest rate on debt instrument (percent)       4.375%      
Debt issuance, percentage of aggregate principal (percent)       98.89%      
Maturity date of senior note       Jun. 15, 2019      
5.875% Senior notes due June 15, 2024 | Senior Notes              
Debt Instrument [Line Items]              
Interest rate on debt instrument (percent)       5.875%      
Debt issuance, percentage of aggregate principal (percent)       98.15%      
Maturity date of senior note       Jun. 15, 2024      
Repurchased principal       $ 10,000   68,100,000  
the Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity under facility             $ 1,000,000,000
Consolidated tangible net worth attributed to Company required under covenants (percent)       97.00%      
the Revolving Facility | the Revolving Facility              
Debt Instrument [Line Items]              
Capitalization of deferred finance costs       $ 5,300,000      
Accrued interest       432,000   402,000  
Borrowing capacity of credit facility             600,000,000
Outstanding debt       0      
Available secured revolving credit facility       $ 818,800,000      
the Revolving Facility | the Revolving Facility | Minimum              
Debt Instrument [Line Items]              
Debt instrument variable interest rate (percent)       1.25%      
the Revolving Facility | the Revolving Facility | Maximum              
Debt Instrument [Line Items]              
Debt instrument variable interest rate (percent)       2.00%      
the Revolving Facility | Letters of credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity under facility       $ 75,000,000      
Outstanding letters of credit       $ 31,200,000   $ 31,800,000  
the Term Facility | Term Loan              
Debt Instrument [Line Items]              
Borrowing capacity of credit facility             $ 250,000,000
the Term Facility | Term Loan | Minimum              
Debt Instrument [Line Items]              
Debt instrument variable interest rate (percent)       1.10%      
the Term Facility | Term Loan | Maximum              
Debt Instrument [Line Items]              
Debt instrument variable interest rate (percent)       1.85%      
Expected draw | the Term Facility | Term Loan              
Debt Instrument [Line Items]              
Expected draw from the Term Facility $ 250,000,000