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Summary of Status of Restricted Stock Units and Changes (Detail) - Restricted Stock Units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Nonvested Stock Units        
Nonvested at beginning period 1,714 1,643 1,621  
Restricted stock units granted 2,326 1,692 1,584  
Restricted stock units vested (1,596) (1,564) (1,505)  
Restricted stock units forfeited (134) (57) (57)  
Nonvested at ending period 2,310 1,714 1,643 1,621
Weighted Average Grant Date Fair Value        
Nonvested at beginning period $ 9.37 $ 8.08 $ 13.85  
Restricted stock units granted 17.62 9.40 8.01  
Restricted stock units vested 9.31 8.02 14.12  
Restricted stock units forfeited 14.99 9.31 9.59  
Nonvested at ending period $ 17.37 $ 9.37 $ 8.08 $ 13.85
Weighted Average Remaining Recognition Period (Years)        
Nonvested at ending period 1 year 6 months 25 days 3 months 21 days 3 months 14 days 4 months 17 days