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Share-Based Payments - Summary of Company's Stock Options Activities (Detail) - 2007 and 2017 Omnibus Equity Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares      
Outstanding at beginning of year (in shares) 1,807,922 1,507,168 1,395,016
Granted (in shares) 102,930 572,637 295,820
Exercised (in shares) (326,818) (244,309) (180,555)
Forfeited, expired, or cancelled (in shares) (84,464) (27,574) (3,113)
Outstanding at period end (in shares) 1,499,570 1,807,922 1,507,168
Vested or expected to vest (in shares) 1,424,592    
Exercisable at period end (in shares) 832,993    
Weighted Average Exercise Price      
Outstanding at beginning of year (in dollars per share) $ 24.68 $ 21.37 $ 16.70
Granted (in dollars per share) 27.86 30.48 37.68
Exercised (in dollars per share) 17.87 16.83 11.87
Forfeited, expired, or cancelled (in dollars per share) 33.64 28.66 25.37
Outstanding at period end (in dollars per share) 22.39 $ 24.68 $ 21.37
Vested or expected to vest (in dollars per share) 25.88    
Exercisable at December 31, 2019 (in dollars per share) $ 19.62    
Weighted Average Remaining Contractual Term      
Outstanding at period end 6 years 5 months 15 days    
Vested or expected to vest 5 years 10 months 6 days    
Exercisable at period end 5 years 10 months 6 days    
Aggregate Intrinsic Value      
Outstanding at period end $ 12,676    
Vested or expected to vest 12,042    
Exercisable at period end $ 12,251