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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
6 Months Ended
Jun. 30, 2013
Restricted Stock Units (RSUs)
 
Number of shares  
Beginning Balance 1,755
Granted   
Vested   
Forfeited or expired (95)
Ending Balance 1,660
Weighted Average Grant Date Fair Value  
Beginning Balance $ 4.23
Granted   
Vested   
Forfeited or expired $ 4.25
Ending Balance $ 4.23