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Income Per Share - Additional Information (Detail) (USD $)
In Thousands, except Share data in Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share [Line Items]        
Stock-based compensation awards outstanding 0.1 0.8 0.1 0.9
Approximate number of common stock share which can be purchased under warrants 16.4   16.4  
Adjusted strike price under warrant 26.35   26.35  
Loss on call spread modification related to convertible notes $ (4,869)    $ (4,869)   
3.75% Convertible Senior Notes [Member]
       
Earnings Per Share [Line Items]        
Interest rate of Senior Notes 3.75%   3.75%  
Convertible senior notes     2014