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Summary of Activity for Restricted Stock Awards (Detail)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Number of Shares  
Unvested at beginning of year | shares 6,904,388
Granted | shares 2,031,198
Vested | shares (2,203,895)
Canceled | shares (215,590)
Unvested at end of year | shares 6,516,101
Weighted Average Grant Date Fair Value  
Unvested at beginning of year | $ / shares $ 14.74
Granted | $ / shares 10.45
Vested | $ / shares 15.18
Canceled | $ / shares 12.89
Unvested at end of year | $ / shares $ 13.31