Quarterly report pursuant to Section 13 or 15(d)

Summary of Treasury Stock Activity (Detail)

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Summary of Treasury Stock Activity (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
shares
Treasury Stock Shares [Abstract]  
Beginning Balance, Shares | shares 4,626,191
Restricted stock withholdings | shares 57,456 [1]
Restricted stock forfeitures | shares 19,351
Ending Balance, Shares | shares 4,702,998
Beginning Balance, Cost | $ $ 79,259
Restricted stock withholdings | $ 2,247 [1]
Restricted stock forfeitures | $ 0
Ending Balance, Cost | $ $ 81,506
[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 $36.81 to $40.32 per share.