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Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jan. 31, 2014
Convertible Senior Subordinated Notes
3/4% convertible senior subordinated notes due 2023
Jun. 30, 2014
Convertible Senior Subordinated Notes
3/4% convertible senior subordinated notes due 2023
Dec. 31, 2013
Convertible Senior Subordinated Notes
3/4% convertible senior subordinated notes due 2023
Dec. 31, 2013
Cash And Cash Equivalents
Dec. 31, 2013
Marketable Securities
Financial assets             $ 1,000 $ 800
Carrying value 0   346     300    
Interest rate (as a percent)         0.75% 0.75%    
Repayments of Long-term Debt $ 6,607 $ 13,000   $ 300