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Long-Term Debt (Sr Secured Credit Facilities) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total Consolidated Secured Debt $ 12,830,043 $ 12,575,294
Senior Secured Credit Facilities [Member]    
Debt Instrument [Line Items]    
Total Consolidated Secured Debt 6,300,000 7,231,222
Senior Secured Credit Facilities [Member] | Term Loan B [Member]    
Debt Instrument [Line Items]    
Total Consolidated Secured Debt $ 0 916,061
Maturity date Jan. 29, 2016  
Senior Secured Credit Facilities [Member] | Term Loan C [Member]    
Debt Instrument [Line Items]    
Total Consolidated Secured Debt $ 0 15,161
Maturity date Jan. 29, 2016  
Senior Secured Credit Facilities [Member] | Term Loan D [Member]    
Debt Instrument [Line Items]    
Total Consolidated Secured Debt $ 5,000,000 5,000,000
Maturity date Jan. 30, 2019  
Senior Secured Credit Facilities [Member] | Term Loan E [Member]    
Debt Instrument [Line Items]    
Total Consolidated Secured Debt $ 1,300,000 $ 1,300,000
Maturity date Jul. 30, 2019