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Summary of Restricted Stock Units Activity (Detail) (Restricted Stock Units (RSUs), USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock Units (RSUs)
     
Number of shares      
Beginning Balance 1,755    
Granted 250    
Vested (115)    
Forfeited or expired (615)    
Ending Balance 1,275 1,755  
Weighted Average Grant Date Fair Value      
Beginning Balance $ 4.23    
Granted $ 1.23 $ 4.23 $ 0
Vested $ 1.10    
Forfeited or expired $ 4.23    
Ending Balance $ 3.93 $ 4.23