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Stockholder's Equity - Activity Relating to Common Shares (Detail)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
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 65
Options exercised 1,725
Restricted stocks grants 950
Shares cancelled (1,446)
Balance, as of June 30, 2014 44,935
Treasury Stock [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Balance, as of December 31, 2013 (8,275)
Shares repurchased (1,672)
Shares acquired through cashless exercise (1,446) [1]
Shares cancelled 1,446
Balance, as of June 30, 2014 (9,947)
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 65
Shares repurchased (1,672)
Options exercised 1,725
Restricted stocks grants 950
Shares acquired through cashless exercise (1,446) [1]
Balance, as of June 30, 2014 34,988
[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.