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2022 Notes with and without Embedded Derivative and Fair Value of Embedded Derivative (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair value of Convertible Notes:    
With the embedded derivatives $ 17,243 $ 15,925
Without the embedded derivatives 16,517 12,455
Estimated fair value of the embedded derivatives $ 726 $ 3,470