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Stock Option Plans - Stock Options Issued (Detail) (USD $) | 6 Months Ended
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Jun. 30, 2014
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Exercisable at end of period (in shares) | 448,940
Exercise price (in usd per share) | $ 37.23
Weighted average term of remaining future expense | 3 years 1 month 6 days
Directors | 5/6/2005 |
Share Based Compensation Arrangements By Share Based Payment Award Options [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 end of period (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
Expensed in previous years | 71,100
Expensed in 2013 | 0
Future expense | 0
Directors | 5/1/2006 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | May 01, 2006
Total grant (in shares) | 30,000
Vested (in shares) | 30,000
Exercised (in shares) | 10,000
Forfeited (in shares) | 2,500
Exercisable at end of period (in shares) | 17,500
Remaining unexercised (in shares) | 17,500
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
Expensed in previous years | 143,400
Expensed in 2013 | 0
Future expense | 0
Directors | 4/27/2007 |
Share Based Compensation Arrangements By Share Based Payment Award Options [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 end of period (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
Expensed in previous years | 285,300
Expensed in 2013 | 0
Future expense | 0
Directors | 4/25/2008 |
Share Based Compensation Arrangements By Share Based Payment Award Options [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 end of period (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
Expensed in previous years | 254,700
Expensed in 2013 | 0
Future expense | 0
Directors | 4/24/2009 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | Apr. 24, 2009
Total grant (in shares) | 32,500
Vested (in shares) | 32,500
Exercised (in shares) | 20,000
Forfeited (in shares) | 0
Exercisable at end of period (in shares) | 12,500
Remaining unexercised (in shares) | 12,500
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
Expensed in previous years | 222,950
Expensed in 2013 | 0
Future expense | 0
Directors | 5/7/2010 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | May 07, 2010
Total grant (in shares) | 32,500
Vested (in shares) | 32,500
Exercised (in shares) | 10,000
Forfeited (in shares) | 2,500
Exercisable at end of period (in shares) | 20,000
Remaining unexercised (in shares) | 20,000
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
Expensed in previous years | 287,950
Expensed in 2013 | 0
Future expense | 0
Directors | 5/13/2011 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | May 13, 2011
Total grant (in shares) | 32,500
Vested (in shares) | 32,500
Exercised (in shares) | 10,000
Forfeited (in shares) | 2,500
Exercisable at end of period (in shares) | 20,000
Remaining unexercised (in shares) | 20,000
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
Expensed in previous years | 297,375
Expensed in 2013 | 0
Future expense | 0
Directors | 5/4/2012 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | May 04, 2012
Total grant (in shares) | 35,000
Vested (in shares) | 35,000
Exercised (in shares) | 10,000
Forfeited (in shares) | 0
Exercisable at end of period (in shares) | 25,000
Remaining unexercised (in shares) | 25,000
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
Expensed in previous years | 244,388
Expensed in 2013 | 0
Future expense | 0
Directors | 5/10/2013 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | May 10, 2013
Total grant (in shares) | 35,000
Vested (in shares) | 35,000
Exercised (in shares) | 7,500
Forfeited (in shares) | 0
Exercisable at end of period (in shares) | 27,500
Remaining unexercised (in shares) | 27,500
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
Expensed in previous years | 262,946
Expensed in 2013 | 0
Future expense | 0
Directors | 5/9/2014 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Total grant (in shares) | 30,000
Vested (in shares) | 30,000
Exercised (in shares) | 0
Forfeited (in shares) | 0
Exercisable at end of period (in shares) | 30,000
Remaining unexercised (in shares) | 30,000
Exercise price (in usd per share) | $ 47.03
Volatility | 0.173
Expected life (years) | 5 years
Assumed yield | 4.48%
Risk-free rate | 1.63%
Total value at grant date | 101,726
Expensed in previous years | 0
Expensed in 2013 | 101,726
Future expense | 0
Directors | Subtotals |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Total grant (in shares) | 317,500
Vested (in shares) | 317,500
Exercised (in shares) | 90,000
Forfeited (in shares) | 22,500
Exercisable at end of period (in shares) | 205,000
Remaining unexercised (in shares) | 205,000
Total value at grant date | 2,171,835
Expensed in previous years | 2,070,109
Expensed in 2013 | 101,726
Future expense | 0
Officers |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Total grant (in shares) | 1,362,500
Vested (in shares) | 716,250
Exercised (in shares) | 233,560
Forfeited (in shares) | 312,500
Exercisable at end of period (in shares) | 448,940
Remaining unexercised (in shares) | 816,440
Total value at grant date | 9,607,810
Estimated forfeitures | 1,847,858
Expensed in previous years | 4,870,181
Expensed in 2013 | 493,784
Future expense | 2,395,987
Officers | 5/6/2005 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | May 06, 2005
Total grant (in shares) | 132,500
Vested (in shares) | 118,750
Exercised (in shares) | 84,850
Forfeited (in shares) | 13,750
Exercisable at end of period (in shares) | 33,900
Remaining unexercised (in shares) | 33,900
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
Estimated forfeitures | 35,100
Expensed in previous years | 378,300
Expensed in 2013 | 0
Future expense | 0
Officers | 4/27/2007 |
Share Based Compensation Arrangements By Share Based Payment Award Options [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 end of period (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 | 1,339,200
Estimated forfeitures | 80,350
Expensed in previous years | 1,258,850
Expensed in 2013 | 0
Future expense | 0
Officers | 5/13/2011 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | May 13, 2011
Total grant (in shares) | 162,500
Vested (in shares) | 105,625
Exercised (in shares) | 30,955
Forfeited (in shares) | 43,750
Exercisable at end of period (in shares) | 63,420
Remaining unexercised (in shares) | 87,795
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 | 1,366,625
Estimated forfeitures | 387,550
Expensed in previous years | 692,088
Expensed in 2013 | 113,205
Future expense | 173,782
Officers | 5/4/2012 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | May 04, 2012
Total grant (in shares) | 242,500
Vested (in shares) | 56,250
Exercised (in shares) | 18,902
Forfeited (in shares) | 135,000
Exercisable at end of period (in shares) | 37,348
Remaining unexercised (in shares) | 88,598
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 | 1,518,050
Estimated forfeitures | 889,690
Expensed in previous years | 261,807
Expensed in 2013 | 78,546
Future expense | 288,007
Officers | 5/10/2013 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | May 10, 2013
Total grant (in shares) | 202,500
Vested (in shares) | 50,625
Exercised (in shares) | 8,853
Forfeited (in shares) | 30,000
Exercisable at end of period (in shares) | 41,772
Remaining unexercised (in shares) | 163,647
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 | 1,401,300
Estimated forfeitures | 280,468
Expensed in previous years | 209,027
Expensed in 2013 | 149,360
Future expense | 762,445
Officers | 5/9/2014 |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Grant date | May 09, 2014
Total grant (in shares) | 170,000
Vested (in shares) | 0
Exercised (in shares) | 0
Forfeited (in shares) | 0
Exercisable at end of period (in shares) | 0
Remaining unexercised (in shares) | 170,000
Exercise price (in usd per share) | $ 47.03
Volatility | 0.306
Expected life (years) | 7 years
Assumed yield | 4.89%
Risk-free rate | 2.17%
Total value at grant date | 1,397,400
Estimated forfeitures | 174,700
Expensed in previous years | 0
Expensed in 2013 | 50,947
Future expense | 1,171,753
Officers | Subtotals |
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] |
Total grant (in shares) | 1,045,000
Vested (in shares) | 398,750
Exercised (in shares) | 143,560
Forfeited (in shares) | 290,000
Exercisable at end of period (in shares) | 243,940
Remaining unexercised (in shares) | 611,440
Total value at grant date | 7,435,975
Estimated forfeitures | 1,847,858
Expensed in previous years | 2,800,072
Expensed in 2013 | 392,058
Future expense | $ 2,395,987

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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 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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