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Debt - Senior Secured Credit Facilities (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Feb. 20, 2014
Line of Credit Facility [Line Items]        
Carrying amount of outstanding debt $ 3,195,000,000 $ 3,084,000,000    
Unamortized discount 10,000,000 13,000,000    
Face value of outstanding debt 2,716,461,000 3,074,171,000    
Outstanding letters of credit that will reduce overall credit capacity 29,000,000 47,000,000    
Senior Secured Credit Facilities [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Credit facility amount     $ 370,000,000 $ 405,000,000
Face value of outstanding debt 70,000,000 0    
Senior Secured Credit Facilities [Member] | Revolving Commitments [Member]        
Line of Credit Facility [Line Items]        
Credit facility amount       $ 35,000,000
Senior Secured Credit Facilities [Member] | Revolver L Plus Two Point Seven Five Percent Two Thousand Nineteen [Member]        
Line of Credit Facility [Line Items]        
Credit facility amount 370,000,000      
Face value of outstanding debt 63,951,000 0    
Senior Secured Credit Facilities [Member] | Revolver L Plus Three Point Seven Five Percent Two Thousand Eighteen [Member]        
Line of Credit Facility [Line Items]        
Credit facility amount 35,000,000      
Face value of outstanding debt $ 6,049,000 $ 0