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Long-term Debt - Schedule of Minimum Repayments for Balances Outstanding for Revolving and Term Loan Credit Facilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-Term Debt $ 2,884,514 $ 3,357,841
Term Loan Credit Facilities [Member]    
Debt Instrument [Line Items]    
2017 211,748  
2018 154,307  
2019 234,762  
2020 186,903  
2021 256,446  
Thereafter 555,919  
Long-Term Debt 1,600,085 1,985,102
Revolving Credit Facilities [Member]    
Debt Instrument [Line Items]    
2017 104,183  
2018 65,923  
2019 197,320  
2020 53,281  
2021 56,416  
Thereafter 481,181  
Long-Term Debt $ 958,304 $ 1,057,093