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, 2017
Dec. 31, 2016
Dec. 31, 2015
Treasury Stock Shares [Abstract]      
Beginning Balance, Shares 4,447,002 4,183,504 4,057,135
Restricted stock forfeitures [1] 10,341 56,808 17,897
Restricted stock withholdings [2] 68,527 206,690 108,472
Ending Balance, Shares 4,525,870 4,447,002 4,183,504
Beginning Balance, Cost $ 73,411 $ 66,577 $ 61,807
Restricted stock forfeitures [1] 0 0 0
Restricted stock withholdings [2] 2,943 6,834 4,770
Ending Balance, Cost $ 76,354 $ 73,411 $ 66,577
[1] The Company repurchased forfeited and canceled restricted shares at a cost of $0.001 per share in accordance with the Company’s 2017 Omnibus Incentive Plan.
[2] The Company withheld restricted shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock. The Company determined the number of shares to be withheld based upon market values that ranged from $29.17 to $44.67 per share.