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Stock Incentive and Employee Stock Purchase Plans - Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock [Member])
12 Months Ended
Dec. 31, 2013
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested at December 31, 2012 1,662,000
Granted 448,000
Vested (628,000)
Forfeited (374,000)
Non-vested at December 31, 2013 1,108,000