Annual report pursuant to Section 13 and 15(d)

Summary of Company's Treasure Stock Activity (Detail)

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Summary of Company's Treasure Stock Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Beginning Balance, Shares 3,391,592 3,359,859  
Common stock repurchased, Shares, as a result of restricted stock forfeitures 14,423 [1] 1,920 [1]  
Restricted stock withholdings 147,070 [2] 25,200 [2]  
Restricted stock awards cancelled, Number of Treasury Shares   4,613 [1]  
Ending Balance, Shares 3,553,085 3,391,592 3,359,859
Beginning Balance $ 45,219 $ 44,725  
Restricted stock forfeitures    [1]    [1]  
Restricted stock withholdings 3,263 [2] 494 [2] 299
Restricted stock awards canceled      [1]  
Ending Balance $ 48,482 $ 45,219 $ 44,725
[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 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 $19.60 to $22.50 per share.