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Interest Expense, Net - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net Investment Income [Line Items]      
Capitalized borrowing cost $ 0 $ 0 $ 0
Senior Unsecured Convertible Debt [Member]      
Net Investment Income [Line Items]      
Interest expense 24,000,000    
Non-cash interest expense accretion of discount on liability component $ 20,000,000    
Issued date of senior unsecured convertible bonds Jul. 31, 2014    
Floating Rate Notes [Member]      
Net Investment Income [Line Items]      
Interest income (expense), net $ 6,000,000 $ 2,000,000  
Floating Rate Notes [Member] | Maximum [Member]      
Net Investment Income [Line Items]      
Interest income (expense), net     $ 1,000,000