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Summary of Activity for Restricted Stock Awards (Detail)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Number of Shares  
Unvested at beginning of year | shares 6,904,388
Granted | shares 2,022,198
Vested | shares (2,189,635)
Canceled | shares (197,470)
Unvested at end of year | shares 6,539,481
Weighted Average Grant Date Fair Value  
Unvested at beginning of year | $ / shares $ 14.74
Granted | $ / shares 10.44
Vested | $ / shares 15.19
Canceled | $ / shares 12.88
Unvested at end of year | $ / shares $ 13.32