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Summary of Restricted Stock Awards and Restricted Stock Units (Detail) (Restricted Stock and Restricted Stock Units, USD $)
9 Months Ended
Sep. 30, 2013
Restricted Stock and Restricted Stock Units
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested Shares, Beginning Balance 2,563,511
Granted, Shares 1,093,724
Vested, Shares (559,505)
Forfeited, Shares (187,136)
Unvested Shares, Ending Balance 2,910,594
Weighted average grant date fair value, Beginning Balance $ 5.12
Granted, Weighted average grant date fair value $ 4.20
Vested, Weighted average grant date fair value $ 4.13
Forfeited, Weighted average grant date fair value $ 4.90
Weighted average grant date fair value, Ending Balance $ 4.98