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Debt - Scheduled Maturities of All Debt Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
January 1, 2016 to December 31, 2016 $ 19,075  
January 1, 2017 to December 31, 2017 260,325  
January 1, 2018 to December 31, 2018 16,575  
January 1, 2019 to December 31, 2019 68,075  
January 1, 2020 to December 31, 2020 16,575  
Thereafter 1,449,125  
Total debt 1,829,750 $ 1,957,000
Senior Notes [Member]    
Debt Instrument [Line Items]    
Thereafter 500,000  
Total debt 500,000  
Bank Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt 1,329,750 $ 1,457,000
Bank Credit Facility [Member] | Revolving Credit [Member]    
Debt Instrument [Line Items]    
January 1, 2019 to December 31, 2019 51,500  
Total debt 51,500  
Bank Credit Facility [Member] | Term Loans [Member]    
Debt Instrument [Line Items]    
January 1, 2016 to December 31, 2016 19,075  
January 1, 2017 to December 31, 2017 260,325  
January 1, 2018 to December 31, 2018 16,575  
January 1, 2019 to December 31, 2019 16,575  
January 1, 2020 to December 31, 2020 16,575  
Thereafter 949,125  
Total debt $ 1,278,250