Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation and Employee Benefit Plans - Fair Value of Stock Options (Detail)

v2.4.0.6
Stock-Based Compensation and Employee Benefit Plans - Fair Value of Stock Options (Detail) (Stock Options [Member], USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average grant date fair value per share (usd per share) $ 0.00 $ 2.45
Risk-free interest rate 0.00% 0.88%
Dividend yield 0.00% 0.00%
Expected life (years) 0 years 4 years 6 months 29 days
Volatility 0.00% 56.00%