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Summary of Treasury Stock Activity (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
shares
Treasury Stock Shares [Abstract]  
Beginning Balance, Shares | shares 4,711,859
Restricted stock withholdings | shares 86,957 [1]
Restricted stock forfeitures | shares 11,244
Ending Balance, Shares | shares 4,810,060
Beginning Balance, Cost | $ $ 81,567
Restricted stock withholdings | $ 2,691 [1]
Restricted stock forfeitures | $ 0
Ending Balance, Cost | $ $ 84,258
[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 $12.30 to $32.12 per share.