Annual report pursuant to Section 13 and 15(d)

Summary of Treasury Stock Activity (Detail)

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Summary of Treasury Stock Activity (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Treasury Stock Shares [Abstract]      
Beginning Balance, Shares 4,626,191 4,525,870 4,447,002
Restricted stock withholdings [1] 59,060 75,801 68,527
Restricted stock forfeitures [2] 26,608 24,520 10,341
Ending Balance, Shares 4,711,859 4,626,191 4,525,870
Beginning Balance, Cost $ 79,259 $ 76,354 $ 73,411
Restricted stock withholdings [1] 2,308 2,905 2,943
Restricted stock forfeitures [2] 0 0 0
Ending Balance, Cost $ 81,567 $ 79,259 $ 76,354
[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 that ranged from $29.17 to $44.44 per share.  
[2] The Company repurchased forfeited restricted shares at a cost of $0.001 per share in accordance with the 2017 Omnibus Plan.