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Stock Option Plan - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  |  |  | 1 Months Ended |  | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Apr. 26, 2004 2004 Options | Apr. 26, 2004 2004 Options Officer | Apr. 26, 2004 2004 Options Director | May 06, 2005 2005 Options | May 06, 2005 2005 Options Officer Person | May 06, 2005 2005 Options Director Person | May 01, 2006 2006 Options | May 01, 2006 2006 Options Director Person | Apr. 27, 2007 2007 Options | Apr. 27, 2007 2007 Options Officer Person | Apr. 27, 2007 2007 Options Director Person | Apr. 25, 2008 2008 Options | Apr. 25, 2008 2008 Options Director Person | Apr. 24, 2009 2009 Options | Apr. 24, 2009 2009 Options Director Person | May 07, 2010 2010 Options | May 07, 2010 2010 Options Director Person | May 13, 2011 2011 Options | May 13, 2011 2011 Options Officer Person | May 13, 2011 2011 Options Director Person | May 04, 2012 2012 Options | May 04, 2012 2012 Options Officer Person | May 04, 2012 2012 Options Director Person | May 10, 2013 2013 Options Person | May 10, 2013 2013 Options Officer | May 10, 2013 2013 Options Director Person | Dec. 31, 1993 Stock Options the 1993 Plan | Dec. 31, 2004 Stock Options Amended 2004 Plan | Dec. 31, 2004 Stock Options Amended 2004 Plan Director | Apr. 26, 2004 Stock Options 2004 Options | Apr. 26, 2004 Stock Options 2004 Options Officer Person | Apr. 26, 2004 Stock Options 2004 Options Director Person | May 06, 2005 Stock Options 2005 Options | May 06, 2005 Stock Options 2005 Options Officer | May 01, 2006 Stock Options 2006 Options | Apr. 27, 2007 Stock Options 2007 Options | Apr. 27, 2007 Stock Options 2007 Options Officer | Apr. 25, 2008 Stock Options 2008 Options | Apr. 24, 2009 Stock Options 2009 Options | May 07, 2010 Stock Options 2010 Options | May 13, 2011 Stock Options 2011 Options | May 13, 2011 Stock Options 2011 Options Officer | May 04, 2012 Stock Options 2012 Options | May 04, 2012 Stock Options 2012 Options Officer | May 10, 2013 Stock Options 2013 Options | May 04, 2012 Stock Options 2013 Options Officer | Apr. 26, 2004 Incentive Stock Option 2004 Options | May 06, 2005 Incentive Stock Option 2005 Options | Apr. 27, 2007 Incentive Stock Option 2007 Options | May 13, 2011 Incentive Stock Option 2011 Options | May 04, 2012 Incentive Stock Option 2012 Options | May 10, 2013 Incentive Stock Option 2013 Options | Apr. 26, 2004 Nonqualified Stock Options 2004 Options | May 06, 2005 Nonqualified Stock Options 2005 Options | Apr. 27, 2007 Nonqualified Stock Options 2007 Options | May 13, 2011 Nonqualified Stock Options 2011 Options | May 04, 2012 Nonqualified Stock Options 2012 Options | May 10, 2013 Nonqualified Stock Options 2013 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized shares for a grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 | 2,000,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted to purchase stocks (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 152,500 |  |  | 162,500 |  | 30,000 | 165,000 |  | 30,000 | 32,500 | 32,500 | 195,000 |  | 277,500 |  | 237,500 |  | 27,500 | 35,500 | 27,560 | 65,300 | 26,157 | 35,592 | 125,000 | 127,000 | 137,440 | 129,700 | 251,343 | 201,908
Number of individuals granted options |  |  |  |  |  |  |  | 12 | 12 |  | 12 |  | 13 | 12 |  | 12 |  | 13 |  | 13 |  | 15 | 13 |  | 15 | 14 | 15 |  | 14 |  |  |  |  | 11 | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan expiration date |  |  |  | Apr. 25, 2014 |  |  | May 05, 2015 |  |  | Apr. 30, 2016 |  | Apr. 26, 2017 |  |  | Apr. 24, 2018 |  | Apr. 23, 2019 |  | May 06, 2020 |  | May 12, 2021 |  |  | May 03, 2022 |  |  | May 10, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested (in percent) |  |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  | 4 years |  |  | 4 years |  |  |  |  | 4 years |  | 4 years |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of options (in usd per share) | $ 44.42 | $ 39.29 | $ 41.82 | $ 25.78 |  |  | $ 33.22 |  |  | $ 40.35 |  | $ 54.17 |  |  | $ 50.15 |  | $ 32.68 |  | $ 38.76 |  | $ 41.82 |  |  | $ 39.29 |  |  | $ 44.42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value stock option grant | $ 8,075,838 |  |  | $ 359,375 | $ 292,775 | $ 66,600 | $ 484,500 | $ 413,400 | $ 71,100 | $ 143,400 |  | $ 1,500,000 | $ 1,300,000 | $ 285,300 | $ 254,700 |  | $ 222,950 |  | $ 287,950 |  | $ 1,600,000 | $ 1,300,000 | $ 297,375 | $ 1,700,000 | $ 1,400,000 | $ 244,388 | $ 1,500,000 | $ 1,300,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of options exercised | 600,000 | 1,600,000 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of options outstanding | 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of options exercisable | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing share price | $ 47.73 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of the Company's exercisable options | 5 years 1 month 1 day |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of the Company's outstanding options | 6 years 9 months 4 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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