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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value Disclosures [Abstract]    
Estimated fair value of Long-term debt (including current maturities) $ 2,554,377  
Carrying amount of company's long term debt $ 2,470,676 $ 1,919,484