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Summary of Restricted Stock Awards and Restricted Stock Units (Detail) (Restricted Stock and Restricted Stock Units, USD $)
3 Months Ended
Mar. 31, 2014
Restricted Stock and Restricted Stock Units
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested Shares, Beginning Balance 2,709,443
Granted, Shares 10,000
Vested, Shares (146,875)
Forfeited, Shares (25,750)
Unvested Shares, Ending Balance 2,546,818
Weighted average grant date fair value, Beginning Balance $ 5.41
Granted, Weighted average grant date fair value $ 9.86
Vested, Weighted average grant date fair value $ 6.10
Forfeited, Weighted average grant date fair value $ 3.89
Weighted average grant date fair value, Ending Balance $ 5.40