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Earnings Per Common Share - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Conversion price of convertible notes, per share   $ 31.25   $ 31.25
Antidilutive stock options and restricted shares 4,586,000 5,421,000 4,677,000 3,678,000
Convertible Debt Securities
       
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Antidilutive stock options and restricted shares 1,150   1,173  
3 3/4% Senior Subordinated Convertible Notes Due 2012
       
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Convertible notes maturity date       Jul. 15, 2012
Senior subordinated convertible notes, interest percentage   3.75%   3.75%