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Income Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
3.75% Convertible Senior Notes [Member]
Dec. 31, 2013
3.75% Convertible Senior Notes [Member]
Earnings Per Share [Line Items]        
Stock-based compensation awards outstanding 0 0.2    
Interest     3.75% 3.75%
Maturity year of note     2014  
Approximate number of common stock share which can be purchased under warrants 14.5      
Adjusted strike price under warrant 25.31   25.31