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Convertible Notes and Long-term Debt Obligations - 1.50% Convertible Senior Notes and Bond Hedge and Warrant Transactions - Aggregate Future Principal Payments For Convertible Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Debt Disclosure [Abstract]
2015	$ 659,795
2019	920,000
Thereafter	1,380,000
Total	$ 2,959,795us-gaap_LongTermDebt

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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