Annual report pursuant to Section 13 and 15(d)

Common Stock and Stockholders' Equity - Summary of Long-Term Incentive Plans (Detail)

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Common Stock and Stockholders' Equity - Summary of Long-Term Incentive Plans (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Shares      
Nonvested beginning balance, shares 2,812,482    
Granted, shares 2,602,973    
Vested, shares (1,636,373)    
Forfeited, shares (370,727)    
Nonvested ending balance, shares   2,812,482  
Weighted Average Grant-Date Fair Value      
Nonvested beginning balance (in usd per share) $ 5.15    
Granted (in usd per share) $ 4.77 $ 5.37 $ 5.61
Vested (in usd per share) $ 5.00    
Forfeited (in usd per share) $ 5.02    
Nonvested ending balance (in usd per share) $ 4.97 $ 5.15