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Stockholder's Equity - Activity Relating to Common Shares (Detail)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares repurchased (1,225) 0
Common Stock [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Balance, as of December 31, 2013 43,641  
Conversion of preferred stock 40  
Options exercised 1,725  
Shares cancelled (1,130)  
Balance, as of March 31, 2014 44,276  
Treasury Stock [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Balance, as of December 31, 2013 (8,275)  
Shares repurchased (1,225)  
Shares acquired through cashless exercise (1) (1,130) [1]  
Shares cancelled 1,130  
Balance, as of March 31, 2014 (9,500)  
Outstanding Shares [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Balance, as of December 31, 2013 35,366  
Conversion of preferred stock 40  
Shares repurchased (1,225)  
Options exercised 1,725  
Shares acquired through cashless exercise (1) (1,130) [1]  
Balance, as of March 31, 2014 34,776  
[1] All shares acquired represent shares tendered to cover the strike price for options and tax withholdings on the intrinsic value of options exercised or restricted stock vested. These shares have been cancelled by the Company.