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Summary of Unvested Restricted Stock (Detail) - Restricted Stock
6 Months Ended
Jun. 30, 2015
$ / shares
shares
Shares  
Beginning balance | shares 2,699,732
Granted | shares 96,509
Vested | shares (596,073)
Expired/Forfeited | shares (49,290)
Ending balance | shares 2,150,878
Weighted Average Grant Date Fair Value  
Beginning balance $ 22.40
Granted 29.33
Vested 31.98
Forfeited/Canceled 38.90
Ending balance $ 19.70