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Fair Value and Carrying Value of Notes (Detail) (Convertible Senior Notes, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Debt Instrument [Line Items]
Carrying Value	$ 1,110,585
Fair Value Measurements At Reporting Date Using Level 2
Debt Instrument [Line Items]
Fair Value	$ 1,111,473

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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