Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Restricted Stock Activity (Detail)

v3.20.4
Stock-Based Compensation - Summary of Restricted Stock Activity (Detail) - Restricted Stock - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Restricted Shares      
Number of shares, outstanding (in shares) 335,298 282,508 327,211
Number of shares, granted 149,012 230,980 87,811
Number of shares, vested (in shares) (184,127) (115,711) (119,180)
Number of shares, forfeited (in shares) (8,292) (62,479) (13,334)
Number of shares, outstanding (in shares) 291,891 335,298 282,508
Weighted Average Grant Date Fair Value      
Weighted average grant date fair value, nonvested (in dollars per share) $ 15.75 $ 9.01 $ 7.27
Weighted average grant date fair value, granted (in dollars per share) 28.45 19.93 12.87
Weighted average grant date fair value, vested (in dollars per share) 12.90 9.36 7.27
Weighted average grant date fair value, forfeited (in dollars per share) 20.75 12.53 7.27
Weighted average grant date fair value, nonvested (in dollars per share) $ 23.82 $ 15.75 $ 9.01
Stock compensation expense $ 3.4 $ 2.6 $ 1.3