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Long-term Debt - Schedule of Future Minimum Repayments of Revolving Credit Facilities and Term Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt $ 3,487,541 $ 2,450,633
Term Loans [Member]    
Debt Instrument [Line Items]    
2019 207,194  
2020 265,270  
2021 412,091  
2022 277,719  
2023 517,640  
Thereafter 478,829  
Long-term debt 2,158,743  
Revolving Credit Facilities [Member]    
Debt Instrument [Line Items]    
2019 197,320  
2020 53,281  
2021 56,416  
2022 422,941  
2023 58,240  
Long-term debt $ 788,198