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Restricted Stock Unit Activity (Detail)
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Time Based Restricted Stock Units  
Shares  
Outstanding at beginning of year 2,631,726
Granted 1,691,246
Vested (1,285,658) [1]
Forfeited (295,766)
Outstanding at end of year 2,741,548
Performance Based Restricted Stock Units  
Shares  
Outstanding at beginning of year 397,315
Vested (38,000) [1]
Outstanding at end of year 359,315
Restricted Stock Units (RSUs)  
Weighted Average Grant Date Fair Value Per Share  
Outstanding at beginning of year | $ / shares $ 15.81
Granted | $ / shares 4.25
Vested | $ / shares 16.32 [1]
Forfeited | $ / shares 13.39
Outstanding at end of year | $ / shares $ 9.52
[1] All of the performance-based restricted stock units that vested during 2020 were granted in 2017.