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Stock-Based Compensation - Summary of Activity in Corporation's Active Stock Plans (Detail) (USD $) | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Shares Available for Grant | 1,157,413 |
Authorized, Shares Available for Grant | 2,293,660 |
Granted, Shares Available for Grant | (5,500) |
Stock options exercised, Shares Available for Grant |  |
Stock awards vested, Shares Available for Grant |  |
Forfeited, Shares Available for Grant | 30,375 |
Cancelled/expired, Shares Available for Grant |  |
Ending Balance, Shares Available for Grant | 3,475,948 |
Beginning Balance, Director Deferred Stock Units Outstanding | 27,724 |
Granted, Director Deferred Stock Units Outstanding | 5,500 |
Stock options exercised, Director Deferred Stock Units Outstanding |  |
Stock awards vested, Director Deferred Stock Units Outstanding |  |
Forfeited, Director Deferred Stock Units Outstanding |  |
Cancelled/expired, Director Deferred Stock Units Outstanding |  |
Ending Balance, Director Deferred Stock Units Outstanding | 33,224 |
Stock options exercised, Number of Shares | (662,224) | (140,311)
Stock Options Outstanding [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 5,513,516 |
Granted, Number of Shares |  |
Stock options exercised, Number of Shares | (662,224) |
Stock awards vested, Number of Shares |  |
Forfeited, Number of Shares | (30,375) |
Cancelled/expired, Number of Shares |  |
Ending Balance, Number of Shares | 4,820,917 |
Beginning Balance, Weighted-Average Exercise Price | $ 51.94 |
Granted, Weighted-Average Exercise Price |  |
Stock options exercised, Weighted-Average Exercise Price | $ 51.63 |
Stock awards vested, Weighted-Average Exercise Price |  |
Forfeited, Weighted-Average Exercise Price | $ 51.32 |
Cancelled/expired, Weighted-Average Exercise Price |  |
Ending Balance, Weighted-Average Exercise Price | $ 51.99 |
Non-Vested Stock Awards/Stock Units Outstanding [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Beginning Balance, Number of Shares | 188,560 |
Granted, Number of Shares |  |
Stock options exercised, Number of Shares |  |
Stock awards vested, Number of Shares |  |
Forfeited, Number of Shares |  |
Cancelled/expired, Number of Shares |  |
Ending Balance, Number of Shares | 188,560 |
Beginning Balance, Weighted-Average Grant-Date Fair Value | $ 51.67 |
Granted, Weighted-Average Grant-Date Fair Value |  |
Stock options exercised, Weighted-Average Grant-Date Fair Value |  |
Stock awards vested, Weighted-Average Grant-Date Fair Value |  |
Forfeited, Weighted-Average Grant-Date Fair Value |  |
Cancelled/expired, Weighted-Average Grant-Date Fair Value |  |
Ending Balance, Weighted-Average Grant-Date Fair Value | $ 51.67 |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(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 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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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