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Stock Option Plan - Stock Options Issued (Detail) (USD $) | 12 Months Ended
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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 |  |

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Namespace Prefix: | bfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Employee and Non Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options + References No definition available. + Details
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- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeited in Period, Fair Value + References No definition available. + Details
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- Definition Share based Compensation Arrangement by Share based Payment Award, Options, Grants in Period, Fair Value + References No definition available. + Details
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- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Remaining Unexercised, Number + References No definition available. + Details
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- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Total Exercises In Period + References No definition available. + Details
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- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Total Grants in Period, Gross + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Options, Vested in Period + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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