Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2013 Age	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options granted	58,207
Non-qualified stock options received by nonemployee board of directors	3,000
Weighted-average grant-date exercise price of options granted	$ 108.24	$ 69.12	$ 86.90
Aggregate intrinsic values of options exercised	$ 7,142,000	$ 7,176,000	$ 1,621,000
Aggregate intrinsic values for options outstanding	10,689,000
Aggregate intrinsic values for options exercisable	8,649,000
Common stock price	$ 99.94
Percentage of incentive compensation to acquire shares, maximum	50.00%
Percentage of discount rate to market value on the incentive compensation	20.00%
Company normal retirement age	62
Awards available for grant	457,000
Common stock reserved for future issuance	250,000
Cumulative shares issued under shareholder value achievement plan	42,025
Recognized tax benefit related to stock-based compensation expense	2,772,000	3,077,000	4,557,000
Options granted in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options expiration date	10 years
Options granted in 2005 through 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options expiration date	8 years
Options granted prior to January 1, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options expiration date	10 years
Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock price	$ 99.94
Weighted-average grant-date fair value of stock awards, granted	$ 99.23	$ 81.41	$ 84.71
Aggregate intrinsic values for stock awards	732,000
Aggregate intrinsic values of stock awards, distributed	466,000	375,000	165,000
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock awards, granted	$ 108.24	$ 69.12	$ 86.90
Aggregate intrinsic values for stock awards	19,693,000
Aggregate intrinsic values of stock awards, distributed	$ 9,413,000	$ 8,695,000	$ 10,237,000
Directors' Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	300,000
Minimum percentage of board of directors retainer required to be paid in common stock	50.00%
Percentage of discount rate to market value on board of directors fees paid in common stock	20.00%
Common stock issued under the plan	6,583	9,502	8,583

Common stock price.

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Company normal retirement age.

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Cumulative shares issued under shareholder value achievement plan.

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Minimum percentage of directors retainer required to be paid in common stock.

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Non-Qualified Stock Options Received By Non-Employee Directors

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Percentage of discount rate to market value on directors fees paid in common stock.

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Percentage Of Discount Rate To The Market Value On The Incentive Compensation

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Percentage Of Incentive Compensation To Acquire Shares Maximum

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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.

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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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of share instruments newly issued under a share-based compensation plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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