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
3 Months Ended
Mar. 31, 2017
USD ($)
shares
Schedule of Treasury Stock [Line Items]  
Beginning Balance, Shares | shares 4,447,002
Restricted stock withholdings | shares 62,318 [1]
Restricted stock forfeitures | shares 855
Ending Balance, Shares | shares 4,510,175
Beginning Balance, Cost | $ $ 73,411
Restricted stock withholdings | $ 2,694 [1]
Restricted stock forfeitures | $ 0
Ending Balance, Cost | $ $ 76,105
[1] The Company withheld 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 $40.40 to $44.44 per share.