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, 2018
Dec. 31, 2017
Dec. 31, 2016
Treasury Stock Shares [Abstract]      
Beginning Balance, Shares 4,525,870 4,447,002 4,183,504
Restricted stock withholdings [1] 75,801 68,527 206,690
Restricted stock forfeitures [2] 24,520 10,341 56,808
Ending Balance, Shares 4,626,191 4,525,870 4,447,002
Beginning Balance, Cost $ 76,354 $ 73,411 $ 66,577
Restricted stock withholdings [1] 2,905 2,943 6,834
Restricted stock forfeitures [2] 0 0 0
Ending Balance, Cost $ 79,259 $ 76,354 $ 73,411
[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.