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Fair Value Measurements - Fair Value Disclosures of Financial Instrument Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Recorded Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net (including current portion) $ (2,299,924) $ (2,382,041)
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net (including current portion) $ (2,492,828) $ (2,531,549)