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, 2018
USD ($)
shares
Treasury Stock Shares [Abstract]  
Beginning Balance, Shares | shares 4,525,870
Restricted stock withholdings | shares 75,801 [1]
Restricted stock forfeitures | shares 20,925
Ending Balance, Shares | shares 4,622,596
Beginning Balance, Cost | $ $ 76,354
Restricted stock withholdings | $ 2,905 [1]
Restricted stock forfeitures | $ 0
Ending Balance, Cost | $ $ 79,259
[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 $33.77 to $39.03 per share.