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Summary of Option Activities (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding Option, Number of shares, beginning balance | 7,436,238 | 7,558,945 | 6,594,950
Granted, Number of Shares | 2,889,750 | 2,966,850 | 2,894,500
Exercised, Number of Shares | (2,288,666) | (2,608,007) | (1,563,255)
Cancelled, Number of Shares | (416,364) | (481,550) | (367,250)
Outstanding Option, Number of shares, ending balance | 7,620,958 | 7,436,238 | 7,558,945
Outstanding Option, Average Option Price, beginning balance | $ 36.31 | $ 31.63 | $ 25.16
Outstanding options vested and exercisable, Number of Shares | 1,756,128 |  |
Granted, Average Option Price | $ 53.51 | $ 37.01 | $ 43.66
Exercised, Average Option Price | $ 32.27 | $ 23.22 | $ 26.38
Cancelled, Average Option Price | $ 43.93 | $ 38.00 | $ 32.60
Outstanding Option, Average Option Price, ending balance | $ 43.63 | $ 36.31 | $ 31.63
Outstanding options vested and exercisable, Average option price | $ 35.60 |  |
32.28 -$16.22 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  |  | $ 32.28
Range, Low |  |  | $ 16.22
54.79 -$38.12 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  |  | $ 54.79
Range, Low |  |  | $ 38.12
46.97 -$16.22 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  | $ 46.97 | $ 46.97
Range, Low |  | $ 16.22 | $ 16.22
54.79 -$16.22 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High | $ 54.79 | $ 54.79 | $ 54.79
Range, Low | $ 16.22 | $ 16.22 | $ 16.22
44.83 -$36.95 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  | $ 44.83 |
Range, Low |  | $ 36.95 |
79.79 -$53.38 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High | $ 79.79 |  |
Range, Low | $ 53.38 |  |
53.38 -$16.22 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High | $ 53.38 |  |
Range, Low | $ 16.22 |  |
79.79 -$30.32 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High | $ 79.79 |  |
Range, Low | $ 30.32 |  |
46.97 -$30.32 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High | $ 46.97 |  |
Range, Low | $ 30.32 |  |

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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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- 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=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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