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Senior Notes, Unsecured Revolving Credit Facility and Seller Financed Loans - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 13, 2014
May 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
May 31, 2015
Debt Instrument [Line Items]                
Capitalization of deferred finance costs     $ 2,536,000   $ 2,536,000   $ 2,179,000  
Accrued interest     3,646,000   3,646,000   2,417,000  
Notes payable and other borrowings     100,000,000   100,000,000   299,392,000  
Seller financed loans     17,758,000   17,758,000   2,434,000  
Interest incurred     16,280,000 $ 15,149,000 31,429,000 $ 30,325,000    
Notes payable [Member]                
Debt Instrument [Line Items]                
Amortization of deferred financing costs     1,600,000 $ 1,300,000 2,900,000 $ 2,500,000    
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Notes payable and other borrowings     100,000,000   100,000,000   299,392,000  
Letters of credit [Member]                
Debt Instrument [Line Items]                
Outstanding letters of credit     5,000,000   5,000,000      
Senior Notes [Member]                
Debt Instrument [Line Items]                
Proceeds from issuance of senior notes, net $ 861,300,000              
Principal payment on Senior Notes     0          
Capitalization of deferred finance costs     23,100,000   23,100,000      
Accrued interest     $ 3,400,000   $ 3,400,000   $ 1,900,000  
4.875% Senior Notes due July 1, 2021 [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Aggregate principal amount   $ 300,000,000            
Interest rate on senior note (percent)   4.875%            
Notes issue price as a percentage of principal amount (percent)   99.44%            
Proceeds from issuance of senior notes, net   $ 295,100,000            
4.375% Senior notes due 2019 [Member]                
Debt Instrument [Line Items]                
Maturity date of senior note             Jun. 15, 2019  
4.375% Senior notes due 2019 [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Interest rate on senior note (percent)   4.375%            
Debt Instrument, Redemption Price, Percentage     98.89%          
Maturity date of senior note         Jun. 15, 2019      
5.875% Senior notes due 2024 [Member]                
Debt Instrument [Line Items]                
Maturity date of senior note             Jun. 15, 2024  
5.875% Senior notes due 2024 [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Interest rate on senior note (percent)   5.875%            
Debt Instrument, Redemption Price, Percentage     98.15%          
Maturity date of senior note         Jun. 15, 2024      
425 million revolving credit facility [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Unsecured revolving credit facility               $ 550,000,000
550 million revolving credit facility [Member] | Letters of credit [Member]                
Debt Instrument [Line Items]                
Unsecured revolving credit facility     $ 75,000,000   $ 75,000,000      
550 million revolving credit facility [Member] | Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Capitalization of deferred finance costs     2,500,000   2,500,000      
Accrued interest     209,000   $ 209,000   $ 407,000  
Unsecured revolving credit facility               $ 625,000,000
Line of credit facility, maturity date         May 18, 2019      
Notes payable and other borrowings     100,000,000   $ 100,000,000      
Interest rate on revolving credit facility (percent)         2.20%      
Available secured revolving credit facility     520,000,000   $ 520,000,000      
550 million revolving credit facility [Member] | Revolving Credit Facility [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Debt instrument variable interest rate (percent)         1.45%      
550 million revolving credit facility [Member] | Revolving Credit Facility [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Debt instrument variable interest rate (percent)         2.20%      
Seller financed loan [Member]                
Debt Instrument [Line Items]                
Seller financed loans     $ 17,758,000   $ 17,758,000   2,434,000  
Seller financed loan [Member] | Loans Payable [Member]                
Debt Instrument [Line Items]                
Interest rate on senior note (percent)     7.00%   7.00%      
Accrued interest     $ 52,000   $ 52,000   $ 89,000  
Seller financed loans     $ 17,800,000   17,800,000      
Minimum principal payment due in June 2017         $ 12,100,000