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Summary of Treasury Stock Activity (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
shares
Treasury Stock Shares [Abstract]  
Beginning Balance, Shares | shares 4,626,191
Restricted stock withholdings | shares 50,081 [1]
Restricted stock forfeitures | shares 8,808
Ending Balance, Shares | shares 4,685,080
Beginning Balance, Cost | $ $ 79,259
Restricted stock withholdings | $ 1,947 [1]
Restricted stock forfeitures | $ 0
Ending Balance, Cost | $ $ 81,206
[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.