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, 2017
USD ($)
shares
Treasury Stock Shares [Abstract]  
Beginning Balance, Shares | shares 4,447,002
Restricted stock withholdings | shares 68,523 [1]
Restricted stock forfeitures | shares 9,550
Ending Balance, Shares | shares 4,525,075
Beginning Balance, Cost | $ $ 73,411
Restricted stock withholdings | $ 2,943 [1]
Restricted stock forfeitures | $ 0
Ending Balance, Cost | $ $ 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 ranging from $33.36 to $44.44 per share.