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Stock-Based Compensation - Summary of Activity in Corporation's Active Stock Plans (Detail) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options exercised, Number of Shares | (53,035) | (110,489) | (153,900) | (428,599)
Director deferred stock units outstanding [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning Balance, Number of Shares |  |  | 48,910 |
Granted, Number of Units |  |  | 7,592 |
Ending Balance, Number of Shares | 56,502 |  | 56,502 |
Beginning Balance, Director Deferred, Weighted-Average Grant-Date Fair Value |  |  | $ 71.14 |
Ending Balance, Director Deferred, Weighted-Average Grant-Date Fair Value | $ 75.38 |  | 75.38 |
Granted Weighted-Average Grant-Date Fair Value |  |  | $ 102.70 |
Non-Vested Stock Awards/Stock Units Outstanding [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning Balance, Number of Shares |  |  | 383,797 |
Granted, Number of Units |  |  | 1,957 |
Stock Awards exercised/vested, Number of shares | (17,800) |  | (17,800) |
Forfeited/expired, Number of Shares |  |  | (3,877) |
Ending Balance, Number of Shares | 364,077 |  | 364,077 |
Beginning Balance, Weighted-Average Grant-Date Fair Value |  |  | $ 85.59 |
Granted Weighted-Average Grant-Date Fair Value |  |  | 91.96 |
Stock Award Exercised/Vested, Weighted Average Grant Date Fair Value |  |  | 65.11 |
Ending Balance, Weighted-Average Grant-Date Fair Value | $ 86.58 |  | 86.58 |
Forfeited/expired, Weighted-Average Exercise Price |  |  | $ 90.10 |
Stock Options Outstanding [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning Balance, Number of Shares |  |  | 2,352,008 |
Stock options exercised, Number of Shares |  |  | (136,100) |
Forfeited/expired, Number of Shares |  |  | (6,875) |
Ending Balance, Number of Shares | 2,209,033 |  | 2,209,033 |
Beginning Balance, Weighted-Average Exercise Price |  |  | $ 63.55 |
Stock options exercised, Weighted-Average Exercise Price |  |  | 57.61 |
Forfeited/expired, Weighted-Average Exercise Price |  |  | 65.11 |
Ending Balance, Weighted-Average Exercise Price | $ 63.91 |  | $ 63.91 |
Maximum [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning Balance, Number of Shares |  |  | 125,809 |
Ending Balance, Number of Shares | 125,809 |  | 125,809 |
Beginning Balance, Weighted-Average Grant-Date Fair Value |  |  | $ 82.55 |
Ending Balance, Weighted-Average Grant-Date Fair Value | $ 82.55 |  | $ 82.55 |

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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 Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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