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, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Treasury Stock [Line Items]      
Beginning Balance, Shares 4,183,504 4,057,135 3,694,935
Restricted stock forfeitures [1] 56,808 17,897 25,947
Restricted stock withholdings [3] 206,690 [2] 108,472 336,253
Ending Balance, Shares 4,447,002 4,183,504 4,057,135
Beginning Balance, Cost $ 66,577 $ 61,807 $ 51,946
Restricted stock forfeitures [1] 0 0 0
Restricted stock withholdings [3] 6,834 [2] 4,770 9,861
Ending Balance, Cost $ 73,411 $ 66,577 $ 61,807
[1] The Company repurchased forfeited and canceled restricted shares at a cost of $0.001 per share in accordance with the Company's Amended and Restated 2006 Long Term Incentive Plan.
[2] The Company determined the number of shares to be withheld based upon market values that ranged from $29.17 to $39.20 per share.
[3] The Company withheld restricted shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock.