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Schedule of Notes (Detail) (Convertible Senior Notes, USD $)
Dec. 31, 2013
Convertible Senior Notes
 
Debt Instrument [Line Items]  
Principal $ 1,437,500,000
Less: note discount (326,915,000)
Net carrying amount 1,110,585,000
Equity component $ 305,569,000 [1]
[1] Recorded in the consolidated balance sheet within additional paid-in capital.