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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value Disclosures [Abstract]    
Estimated fair value of long-term debt, including the current portion $ 2,180,000 $ 2,150,000
Long-term debt, gross $ 2,150,000 $ 2,100,000