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Fair Value Measurements - Additional Information (Detail) (USD $)
3 Months Ended
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Financial Instruments [Line Items]      
Impairment charge $ 14,000,000    
Remaining fair value of intangible assets 99,000,000    
Estimated fair value of long-term debt, including the current portion   1,620,000,000 1,630,000,000
Long-term debt   $ 1,600,000,000 $ 1,500,000,000