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Summary of Option Activities (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding Options, Number of shares, beginning balance | 9,639,949 | 8,770,133 | 8,400,183
Granted, Number of Shares | 2,567,653 | 3,061,725 | 2,945,550
Exercised, Number of Shares | (1,591,859) | (1,734,409) | (2,162,850)
Cancelled, Number of Shares | (940,952) | (457,500) | (412,750)
Outstanding Options, Number of shares, ending balance | 9,674,791 | 9,639,949 | 8,770,133
Outstanding options vested and exercisable, Number of Shares | 3,724,179 |  |
Outstanding Options, Average Option Price, beginning balance | $ 112.40 | $ 99.06 | $ 80.50
Granted, Average Option Price | 119.73 | 124.38 | 118.72
Exercised, Average Option Price | 100.95 | 64.41 | 53.02
Cancelled, Average Option Price | 121.07 | 118.65 | 103.01
Outstanding Options, Average Option Price, ending balance | 115.39 | 112.40 | 99.06
Outstanding options vested and exercisable, Average Option Price | 106.77 |  |
$142.43-$36.95 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  | 142.43 | 142.43
Range, Low |  | 36.95 | 36.95
$138.00-$107.39 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  |  | 138.00
Range, Low |  |  | 107.39
$117.29-$36.95 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  |  | 117.29
Range, Low |  |  | 36.95
$130.32-$36.95 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  |  | 130.32
Range, Low |  |  | $ 36.95
$124.56-$110.15 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  | 124.56 |
Range, Low |  | 110.15 |
$118.62-$36.95 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  | 118.62 |
Range, Low |  | 36.95 |
$142.43-$53.38 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High |  | 142.43 |
Range, Low |  | $ 53.38 |
$138.00-$53.38 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High | 138.00 |  |
Range, Low | 53.38 |  |
$127.29-$112.68 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High | 127.29 |  |
Range, Low | 112.68 |  |
$124.56-$53.38 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High | 124.56 |  |
Range, Low | 53.38 |  |
$136.00-$78.17 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High | 136.00 |  |
Range, Low | 78.17 |  |
$138.00-$78.17 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range, High | 138.00 |  |
Range, Low | $ 78.17 |  |

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- Definition Weighted average price of options that were either forfeited or expired. + 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)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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