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Summary of Treasury Stock Activity (Detail)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Treasury Stock Shares [Abstract]  
Beginning Balance, Shares | shares 4,711,859
Restricted stock withholdings | shares 94,882 [1]
Restricted stock forfeitures | shares 27,723
Ending Balance, Shares | shares 4,834,464
Beginning Balance, Cost | $ $ 81,567
Restricted stock withholdings | $ 2,798 [1]
Restricted stock forfeitures | $ 0
Ending Balance, Cost | $ $ 84,365
[1] The Company withheld restricted shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock and restricted stock units.  The Company determined the number of shares to be withheld based upon market values ranging from $8.03 to $32.12 per share.