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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Aug. 19, 2015
Oct. 10, 2013
Debt Instrument [Line Items]        
Principal amount $ 3,348,740      
Debt issue costs, net (28,367) $ (27,006)    
Debt $ 3,322,541 $ 2,174,648    
2011 Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Senior unsecured notes, interest rate 6.875% 6.875%    
Debt $ 450,000 $ 450,000    
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Interest rate Variable Variable    
Debt $ 1,100,000 $ 593,490    
2006 Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Interest rate Various Various    
Debt $ 125,000 $ 125,000    
2012 Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Principal amount $ 350,000 $ 350,000    
Senior unsecured notes, interest rate 6.375% 6.375%    
Unamortized premium $ 2,168 $ 2,522    
Debt $ 352,168 $ 352,522    
2013 Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Senior unsecured notes, interest rate 5.75% 5.75%   5.75%
Debt $ 217,240 $ 241,960    
2014 Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Senior unsecured notes, interest rate 5.50% 5.50%    
Debt $ 300,000 $ 300,000    
2015 Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Senior unsecured notes, interest rate 4.00%   4.00%  
Debt $ 543,100      
Term Loans [Member]        
Debt Instrument [Line Items]        
Interest rate Various Various    
Debt $ 263,400 $ 138,682    
Senior Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Debt $ 3,350,908 $ 2,201,654