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Stock Option Plan - Stock Options Issued (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total grant (in shares) 1,315,000    
Vested (in shares) 714,375    
Exercised (in shares) 278,875    
Forfeited (in shares) 282,500    
Exercisable at December 31 (in shares) 413,000 377,715 512,085
Remaining unexercised (in shares) 753,625    
Exercise price (in usd per share) $ 33.15 $ 31.03 $ 29.03
Total value at grant date $ 8,075,838    
Forfeited options 1,119,125    
Expensed in previous years 3,139,107    
Future expense 1,745,084    
Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 588,613    
Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 619,503    
Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 864,406    
Subtotals
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total grant (in shares) 997,500    
Vested (in shares) 396,875    
Exercised (in shares) 191,375    
Forfeited (in shares) 260,000    
Exercisable at December 31 (in shares) 205,500    
Remaining unexercised (in shares) 546,125    
Total value at grant date 5,939,129    
Forfeited options 1,119,125    
Expensed in previous years 1,807,107    
Future expense 1,745,084    
Directors
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 124,400 110,000 109,000
Directors | 4/26/2004
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date Apr. 26, 2004    
Total grant (in shares) 30,000    
Vested (in shares) 30,000    
Exercised (in shares) 25,000    
Forfeited (in shares) 0    
Exercisable at December 31 (in shares) 5,000    
Remaining unexercised (in shares) 5,000    
Exercise price (in usd per share) $ 25.78    
Volatility 0.183    
Expected life (years) 5 years    
Assumed yield 5.75%    
Risk-free rate 3.57%    
Total value at grant date 66,600    
Forfeited options 0    
Expensed in previous years 66,600    
Future expense 0    
Directors | 4/26/2004 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/26/2004 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/26/2004 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/6/2005
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date May 06, 2005    
Total grant (in shares) 30,000    
Vested (in shares) 30,000    
Exercised (in shares) 22,500    
Forfeited (in shares) 0    
Exercisable at December 31 (in shares) 7,500    
Remaining unexercised (in shares) 7,500    
Exercise price (in usd per share) $ 33.22    
Volatility 0.198    
Expected life (years) 10 years    
Assumed yield 6.91%    
Risk-free rate 4.28%    
Total value at grant date 71,100    
Forfeited options 0    
Expensed in previous years 71,100    
Future expense 0    
Directors | 5/6/2005 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/6/2005 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/6/2005 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/1/2006
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date May 01, 2006    
Total grant (in shares) 30,000    
Vested (in shares) 30,000    
Exercised (in shares) 5,000    
Forfeited (in shares) 2,500    
Exercisable at December 31 (in shares) 22,500    
Remaining unexercised (in shares) 22,500    
Exercise price (in usd per share) $ 40.35    
Volatility 0.206    
Expected life (years) 9 years    
Assumed yield 5.93%    
Risk-free rate 5.11%    
Total value at grant date 143,400    
Forfeited options 0    
Expensed in previous years 143,400    
Future expense 0    
Directors | 5/1/2006 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/1/2006 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/1/2006 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/27/2007
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date Apr. 27, 2007    
Total grant (in shares) 30,000    
Vested (in shares) 30,000    
Exercised (in shares) 0    
Forfeited (in shares) 7,500    
Exercisable at December 31 (in shares) 22,500    
Remaining unexercised (in shares) 22,500    
Exercise price (in usd per share) $ 54.17    
Volatility 0.225    
Expected life (years) 8 years    
Assumed yield 4.39%    
Risk-free rate 4.65%    
Total value at grant date 285,300    
Forfeited options 0    
Expensed in previous years 285,300    
Future expense 0    
Directors | 4/27/2007 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/27/2007 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/27/2007 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/25/2008
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date Apr. 25, 2008    
Total grant (in shares) 30,000    
Vested (in shares) 30,000    
Exercised (in shares) 0    
Forfeited (in shares) 7,500    
Exercisable at December 31 (in shares) 22,500    
Remaining unexercised (in shares) 22,500    
Exercise price (in usd per share) $ 50.15    
Volatility 0.237    
Expected life (years) 7 years    
Assumed yield 4.09%    
Risk-free rate 3.49%    
Total value at grant date 254,700    
Forfeited options 0    
Expensed in previous years 254,700    
Future expense 0    
Directors | 4/25/2008 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/25/2008 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/25/2008 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/24/2009
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date Apr. 24, 2009    
Total grant (in shares) 32,500    
Vested (in shares) 32,500    
Exercised (in shares) 17,500    
Forfeited (in shares) 0    
Exercisable at December 31 (in shares) 15,000    
Remaining unexercised (in shares) 15,000    
Exercise price (in usd per share) $ 32.68    
Volatility 0.344    
Expected life (years) 6 years    
Assumed yield 4.54%    
Risk-free rate 2.19%    
Total value at grant date 222,950    
Forfeited options 0    
Expensed in previous years 222,950    
Future expense 0    
Directors | 4/24/2009 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/24/2009 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 4/24/2009 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/7/2010
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date May 07, 2010    
Total grant (in shares) 32,500    
Vested (in shares) 32,500    
Exercised (in shares) 5,000    
Forfeited (in shares) 2,500    
Exercisable at December 31 (in shares) 25,000    
Remaining unexercised (in shares) 25,000    
Exercise price (in usd per share) $ 38.76    
Volatility 0.369    
Expected life (years) 5 years    
Assumed yield 4.23%    
Risk-free rate 2.17%    
Total value at grant date 287,950    
Forfeited options 0    
Expensed in previous years 287,950    
Future expense 0    
Directors | 5/7/2010 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/7/2010 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/7/2010 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/13/2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date May 13, 2011    
Total grant (in shares) 32,500    
Vested (in shares) 32,500    
Exercised (in shares) 5,000    
Forfeited (in shares) 2,500    
Exercisable at December 31 (in shares) 25,000    
Remaining unexercised (in shares) 25,000    
Exercise price (in usd per share) $ 41.82    
Volatility 0.358    
Expected life (years) 5 years    
Assumed yield 4.16%    
Risk-free rate 1.86%    
Total value at grant date 297,375    
Forfeited options 0    
Expensed in previous years 0    
Future expense 0    
Directors | 5/13/2011 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 297,375    
Directors | 5/13/2011 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/13/2011 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/4/2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date May 04, 2012    
Total grant (in shares) 35,000    
Vested (in shares) 35,000    
Exercised (in shares) 5,000    
Forfeited (in shares) 0    
Exercisable at December 31 (in shares) 30,000    
Remaining unexercised (in shares) 30,000    
Exercise price (in usd per share) $ 39.29    
Volatility 0.348    
Expected life (years) 5 years    
Assumed yield 4.61%    
Risk-free rate 0.78%    
Total value at grant date 244,388    
Forfeited options 0    
Expensed in previous years 0    
Future expense 0    
Directors | 5/4/2012 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/4/2012 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 244,388    
Directors | 5/4/2012 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/10/2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date May 10, 2013    
Total grant (in shares) 35,000    
Vested (in shares) 35,000    
Exercised (in shares) 2,500    
Forfeited (in shares) 0    
Exercisable at December 31 (in shares) 32,500    
Remaining unexercised (in shares) 32,500    
Exercise price (in usd per share) $ 44.42    
Volatility 0.333    
Expected life (years) 5 years    
Assumed yield 4.53%    
Risk-free rate 0.82%    
Total value at grant date 262,946    
Forfeited options 0    
Expensed in previous years 0    
Future expense 0    
Directors | 5/10/2013 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/10/2013 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Directors | 5/10/2013 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 262,946    
Directors | Subtotals
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total grant (in shares) 317,500    
Vested (in shares) 317,500    
Exercised (in shares) 87,500    
Forfeited (in shares) 22,500    
Exercisable at December 31 (in shares) 207,500    
Remaining unexercised (in shares) 207,500    
Total value at grant date 2,136,709    
Forfeited options 0    
Expensed in previous years 1,332,000    
Future expense 0    
Directors | Subtotals | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 297,375    
Directors | Subtotals | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 244,388    
Directors | Subtotals | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 262,946    
Officers | 4/26/2004
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date Apr. 26, 2004    
Total grant (in shares) 122,500    
Vested (in shares) 115,000    
Exercised (in shares) 103,750    
Forfeited (in shares) 7,500    
Exercisable at December 31 (in shares) 11,250    
Remaining unexercised (in shares) 11,250    
Exercise price (in usd per share) $ 25.78    
Volatility 0.183    
Expected life (years) 7 years    
Assumed yield 5.75%    
Risk-free rate 4.05%    
Total value at grant date 292,775    
Forfeited options 17,925    
Expensed in previous years 274,850    
Future expense 0    
Officers | 4/26/2004 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Officers | 5/6/2005
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date May 06, 2005    
Total grant (in shares) 132,500    
Vested (in shares) 118,750    
Exercised (in shares) 69,500    
Forfeited (in shares) 13,750    
Exercisable at December 31 (in shares) 49,250    
Remaining unexercised (in shares) 49,250    
Exercise price (in usd per share) $ 33.22    
Volatility 0.207    
Expected life (years) 8 years    
Assumed yield 6.37%    
Risk-free rate 4.15%    
Total value at grant date 413,400    
Forfeited options 35,100    
Expensed in previous years 378,300    
Future expense 0    
Officers | 5/6/2005 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Officers | 4/27/2007
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date Apr. 27, 2007    
Total grant (in shares) 135,000    
Vested (in shares) 67,500    
Exercised (in shares) 0    
Forfeited (in shares) 67,500    
Exercisable at December 31 (in shares) 67,500    
Remaining unexercised (in shares) 67,500    
Exercise price (in usd per share) $ 54.17    
Volatility 0.233    
Expected life (years) 6 years 6 months    
Assumed yield 4.13%    
Risk-free rate 4.61%    
Total value at grant date 1,258,848    
Forfeited options 0    
Expensed in previous years 1,153,957    
Future expense 0    
Weighted average term of remaining future expense 2 years 9 months 7 days    
Officers | 4/27/2007 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 104,891    
Officers | 4/27/2007 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Officers | 4/27/2007 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Officers | 5/13/2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date May 13, 2011    
Total grant (in shares) 162,500    
Vested (in shares) 67,500    
Exercised (in shares) 16,250    
Forfeited (in shares) 41,250    
Exercisable at December 31 (in shares) 51,250    
Remaining unexercised (in shares) 105,000    
Exercise price (in usd per share) $ 41.82    
Volatility 0.330    
Expected life (years) 8 years    
Assumed yield 4.81%    
Risk-free rate 2.75%    
Total value at grant date 1,277,794    
Forfeited options 252,300    
Expensed in previous years 0    
Future expense 333,406    
Officers | 5/13/2011 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 186,347    
Officers | 5/13/2011 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 270,391    
Officers | 5/13/2011 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 235,350    
Officers | 5/4/2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date May 04, 2012    
Total grant (in shares) 242,500    
Vested (in shares) 28,125    
Exercised (in shares) 1,875    
Forfeited (in shares) 130,000    
Exercisable at December 31 (in shares) 26,250    
Remaining unexercised (in shares) 110,625    
Exercise price (in usd per share) $ 39.29    
Volatility 0.315    
Expected life (years) 8 years    
Assumed yield 5.28%    
Risk-free rate 1.49%    
Total value at grant date 1,442,148    
Forfeited options 813,800    
Expensed in previous years 0    
Future expense 366,541    
Officers | 5/4/2012 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Officers | 5/4/2012 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 104,724    
Officers | 5/4/2012 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 157,083    
Officers | 5/10/2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date May 10, 2013    
Total grant (in shares) 202,500    
Vested (in shares) 0    
Exercised (in shares) 0    
Forfeited (in shares) 0    
Exercisable at December 31 (in shares) 0    
Remaining unexercised (in shares) 202,500    
Exercise price (in usd per share) $ 44.42    
Volatility 0.304    
Expected life (years) 8 years    
Assumed yield 5.12%    
Risk-free rate 1.49%    
Total value at grant date 1,254,164    
Forfeited options 0    
Expensed in previous years 0    
Future expense 1,045,137    
Officers | 5/10/2013 | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Officers | 5/10/2013 | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 0    
Officers | 5/10/2013 | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 209,027    
Officers | Subtotals | Expensed in 2011
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 291,238    
Officers | Subtotals | Expensed in 2012
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation 375,115    
Officers | Subtotals | Expensed in 2013
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share based compensation $ 601,460