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Fair Value Measurements - Additional Information (Detail) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Financial Instruments [Line Items]      
Estimated fair value of long-term debt, including the current portion $ 2,190,000,000 $ 1,620,000,000 $ 1,690,000,000
Long-term debt $ 2,100,000,000 $ 1,600,000,000 $ 1,650,000,000