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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Estimated fair value of Long-term debt (including current maturities) $ 3,139,761  
Gross amount of company's long term debt 3,079,710  
Carrying amount of company's long term debt $ 3,079,710 $ 2,914,552