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Stock Option Plan - Additional Information (Detail)											12 Months Ended
	May. 08, 2015 USD ($) person $ / shares shares	May. 09, 2014 USD ($) person $ / shares shares	May. 10, 2013 USD ($) person $ / shares shares	May. 04, 2012 USD ($) person $ / shares shares	May. 13, 2011 USD ($) person $ / shares shares	May. 07, 2010 USD ($) person $ / shares shares	Apr. 24, 2009 USD ($) person $ / shares shares	Apr. 25, 2008 USD ($) person $ / shares shares	Apr. 27, 2007 USD ($) person $ / shares shares	May. 01, 2006 USD ($) person $ / shares shares	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 $ / shares	Dec. 31, 2013 $ / shares	Dec. 31, 2004 shares	Dec. 31, 1993 shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price of options (in usd per share) | $ / shares											$ 51.07	$ 47.03	$ 44.42
Fair value stock option grant | $											$ 10,822,000
the 1993 Plan | Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Authorized shares for a grant															400,000
Amended 2004 Plan | Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Authorized shares for a grant														2,000,000
Amended 2004 Plan | Stock Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Authorized shares for a grant														200,000
2006 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price of options (in usd per share) | $ / shares										$ 40.35
Fair value stock option grant | $										$ 143,400
2006 Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person										12
2006 Options | Stock Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)										0
2006 Options | Stock Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)										30,000
2007 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price of options (in usd per share) | $ / shares									$ 54.17
Fair value stock option grant | $									$ 1,500,000
2007 Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person									13
Options vested (in percent)									25.00%
Fair value stock option grant | $									$ 1,300,000
2007 Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person									12
Fair value stock option grant | $									$ 285,300
2007 Options | Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)									165,000
2007 Options | Stock Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option vesting period									4 years
2007 Options | Incentive Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)									27,560
2007 Options | Nonqualified Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)									137,440
2008 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price of options (in usd per share) | $ / shares								$ 50.15
Fair value stock option grant | $								$ 254,700
2008 Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person								12
2008 Options | Stock Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)								0
2008 Options | Stock Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)								30,000
2009 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price of options (in usd per share) | $ / shares							$ 32.68
Fair value stock option grant | $							$ 222,950
2009 Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person							13
2009 Options | Stock Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)							0
2009 Options | Stock Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)							32,500
2010 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price of options (in usd per share) | $ / shares						$ 38.76
Fair value stock option grant | $						$ 287,950
2010 Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person						13
2010 Options | Stock Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)						0
2010 Options | Stock Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)						32,500
2011 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price of options (in usd per share) | $ / shares					$ 41.82
Fair value stock option grant | $					$ 1,600,000
2011 Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person					15
Options vested (in percent)					25.00%
Fair value stock option grant | $					$ 1,300,000
2011 Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person					13
Fair value stock option grant | $					$ 297,375
2011 Options | Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)					195,000
2011 Options | Stock Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option vesting period					4 years
2011 Options | Incentive Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)					65,300
2011 Options | Nonqualified Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)					129,700
2012 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price of options (in usd per share) | $ / shares				$ 39.29
Fair value stock option grant | $				$ 1,700,000
2012 Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person				15
Options vested (in percent)				25.00%
Fair value stock option grant | $				$ 1,400,000
2012 Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person				14
Fair value stock option grant | $				$ 257,250
2012 Options | Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)				277,500
2012 Options | Stock Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option vesting period				4 years
2012 Options | Incentive Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)				26,157
2012 Options | Nonqualified Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)				251,343
2013 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person			15
Exercise price of options (in usd per share) | $ / shares			$ 44.42
Fair value stock option grant | $			$ 1,500,000
2013 Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options vested (in percent)			25.00%
Fair value stock option grant | $			$ 1,300,000
2013 Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person			14
Fair value stock option grant | $			$ 300,000
2013 Options | Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)			237,500
2013 Options | Stock Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option vesting period			4 years
2013 Options | Incentive Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)			35,592
2013 Options | Nonqualified Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)			201,908
2014 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price of options (in usd per share) | $ / shares		$ 47.03
Fair value stock option grant | $		$ 1,300,000
2014 Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person		18
Options vested (in percent)		25.00%
Fair value stock option grant | $		$ 1,200,000
2014 Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person		12
Fair value stock option grant | $		$ 109,500
2014 Options | Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)		200,000
2014 Options | Stock Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option vesting period		4 years
2014 Options | Incentive Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)		29,300
2014 Options | Nonqualified Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)		170,700
2015 Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price of options (in usd per share) | $ / shares	$ 51.07
Fair value stock option grant | $	$ 1,600,000
2015 Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person	19
Options vested (in percent)	25.00%
Fair value stock option grant | $	$ 1,400,000
2015 Options | Director
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of individuals granted options | person	14
Fair value stock option grant | $	$ 125,300
2015 Options | Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)	225,000
2015 Options | Stock Options | Officer
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Option vesting period	4 years
2015 Options | Incentive Stock Option
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)	33,690
2015 Options | Nonqualified Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options granted to purchase stocks (in shares)	191,310

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Net number of share options (or share units) granted during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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