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Fair Value Measurements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 12, 2014
Sep. 26, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value measurements assets, significant transfers from level 1 to level 2 $ 0 $ 0      
Fair value measurements assets, significant transfers from level 2 to level 1 0 0      
Fair value measurements liabilities, significant transfers from level 1 to level 2 0 0      
Fair value measurements liabilities, significant transfers from level 2 to level 1 0 0      
Gain associated with remeasuring of investment in a previously unconsolidated subsidiary to fair value as of date $ 100,420,000        
Percentage of remeasuring investment in previously unconsolidated subsidiary 50.00%        
Remaining controlling interest acquired percentage 50.00%        
Fair value of investment in unconsolidated subsidiary at acquisition date $ 110,100,000        
Senior notes   791,700,000      
Notes payable on real estate 6,300,000 17,900,000      
4.875% Senior Notes [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated fair value of senior loans $ 616,400,000 $ 645,700,000      
Interest rate of long-term debt 4.875% 4.875%      
Senior notes $ 592,800,000 $ 592,000,000      
5.25% Senior Notes [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated fair value of senior loans $ 443,700,000 $ 468,000,000      
Interest rate of long-term debt 5.25% 5.25%   5.25% 5.25%
Senior notes $ 422,700,000 $ 422,400,000      
5.00% Senior Notes [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated fair value of senior loans   $ 823,800,000      
Interest rate of long-term debt 5.00% 5.00%      
Senior notes   $ 791,700,000      
Redemption details In March 2018, we redeemed our 5.00% senior notes in full        
Senior term loans [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated fair value of senior loans $ 757,000,000 199,900,000      
Senior term loans 751,300,000 193,500,000      
Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets, fair value disclosure, nonrecurring   0 $ 0    
Liabilities, fair value disclosure, nonrecurring   $ 0 $ 0    
Previously Unconsolidated Subsidiary [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain associated with remeasuring of investment in a previously unconsolidated subsidiary to fair value as of date $ 100,400,000