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Fair Value Measurements - Additional Information (Detail) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
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
Senior term loans [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Estimated fair value of senior loans 864,400,000 $ 878,600,000  
Senior term loans 864,800,000 877,900,000  
5.00% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Estimated fair value of senior loans $ 832,000,000 $ 802,600,000  
Interest rate of long-term debt 5.00% 5.00%  
Senior notes $ 789,800,000 $ 789,100,000  
5.00% Senior Notes [Member] | Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate of long-term debt 5.00% 5.00%  
4.875% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Estimated fair value of senior loans $ 620,500,000 $ 598,800,000  
Interest rate of long-term debt 4.875% 4.875%  
Senior notes $ 590,800,000 $ 590,500,000  
4.875% Senior Notes [Member] | Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate of long-term debt 4.875% 4.875%  
5.25% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Estimated fair value of senior loans $ 453,700,000 $ 430,400,000  
Interest rate of long-term debt 5.25% 5.25%  
Senior notes $ 422,100,000 $ 422,000,000  
5.25% Senior Notes [Member] | Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate of long-term debt 5.25% 5.25%  
Senior notes $ 426,591,000 $ 426,682,000