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Employee Benefit Plans (Summary of Activity in Corporation's Active Stock Plans) (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Ending balance, shares available for grant | 1,367,750 |  |
Stock options exercised, number of shares | (1,150,920) | (1,509,121) | (321,266)
Beginning balance, non-vested weighted-average grant-date fair value |  | $ 10.23 |
Ending balance, non-vested weighted-average grant-date fair value |  |  | $ 10.23
Director deferred stock units outstanding [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Beginning balance, number of shares | 53,659 | 45,443 | 38,867
Granted, number of shares | 5,447 | 8,216 | 6,576
Stock awards exercised/vested, number of shares | (6,098) |  |
Ending balance, number of shares | 53,008 | 53,659 | 45,443
Beginning balance, Director Deferred, weighted-average grant-date fair value | $ 61.48 | $ 61.35 | $ 59.39
Granted, weighted-average grant-date fair value | 95.37 | 63.25 | 72.94
Stock awards exercised/vested, weighted-average grant date fair value | 62.29 |  |
Ending balance, Director Deferred, weighted-average grant-date fair value | $ 64.87 | $ 61.48 | $ 61.35
Non-Vested Stock Awards/ Stock Units Outstanding [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Beginning balance, number of shares | 256,850 | 173,180 | 175,490
Granted, number of shares | 99,833 | 132,800 | 53,990
Stock awards exercised/vested, number of shares | (39,740) | (49,130) | (56,300)
Forfeited/expired, number of shares | (4,287) |  |
Ending balance, number of shares | 312,656 | 256,850 | 173,180
Beginning balance, non-vested weighted-average grant-date fair value | $ 73.43 | $ 66.05 | $ 60.55
Granted, weighted-average grant-date fair value | 98.90 | 76.07 | 65.11
Stock awards exercised/vested, weighted-average grant date fair value | 71.59 | 54.56 | 48.00
Ending balance, non-vested weighted-average grant-date fair value | 81.71 | $ 73.43 | $ 66.05
Forfeited/expired, weighted-average exercise price | $ 79.52 |  |
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted, number of shares | 24,162 | 29,240 |
Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Beginning balance, number of shares | 4,089,028 | 5,612,240 | 5,029,882
Granted, number of shares | 0 | 0 | 890,940
Stock options exercised, number of shares | (1,118,122) | (1,476,841) | (287,326)
Forfeited/expired, number of shares | (53,764) | (46,371) | (21,256)
Ending balance, number of shares | 2,917,142 | 4,089,028 | 5,612,240
Beginning balance, weighted-average exercise price | $ 62.67 | $ 60.30 | $ 58.99
Granted, weighted-average exercise price |  |  | 65.11
Stock options exercised, weighted-average exercise price | 60.59 | 53.40 | 51.70
Forfeited/expired, weighted-average exercise price | 69.78 | 71.04 | 66.72
Ending balance, weighted-average exercise price | $ 63.34 | $ 62.67 | $ 60.30
Maximum [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Beginning balance, number of shares | 43,860 |  |
Granted, number of shares | 36,243 | 43,860 |
Ending balance, number of shares | 80,103 | 43,860 |
Beginning balance, non-vested weighted-average grant-date fair value | $ 69.70 |  |
Granted, weighted-average grant-date fair value | 92.27 | $ 69.70 |
Ending balance, non-vested weighted-average grant-date fair value | $ 79.91 | $ 69.70 |

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- Definition 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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition 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. + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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