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Fair Value Measurements - Additional Information (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Financial Instruments [Line Items]
Estimated fair value of long-term debt, including the current portion	$ 1,660,000,000	$ 1,620,000,000	$ 1,770,000,000
Long-term debt	$ 1,600,000,000	$ 1,600,000,000	$ 1,650,000,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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