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Stock-Based Compensation - Stock Options Outstanding Roll Forward (Detail) shares in Thousands | 3 Months Ended
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Mar. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Outstanding at December 31, 2017 | shares | 2,039
Granted | shares | 133
Exercised | shares | (222)
Canceled | shares | (44)
Outstanding at March 31, 2018 | shares | 1,906
Weighted-average exercise price of options outstanding at beginning of period | $ 124.41
Weighted-average exercise price of options granted | 206.66
Weighted-average exercise price of options exercised | 102.43
Weighted average exercise price of options canceled | 119.62
Weighted-average exercise price of options outstanding at end of period | 132.82
Minimum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-average exercise price of options outstanding at beginning of period | 38.09
Weighted-average exercise price of options granted | 195.69
Weighted-average exercise price of options exercised | 38.09
Weighted average exercise price of options canceled | 98.21
Weighted-average exercise price of options outstanding at end of period | 38.09
Maximum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-average exercise price of options outstanding at beginning of period | 194.26
Weighted-average exercise price of options granted | 208.47
Weighted-average exercise price of options exercised | 154.33
Weighted average exercise price of options canceled | 128.93
Weighted-average exercise price of options outstanding at end of period | $ 208.47

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- Definition For presentations that combine terminations, 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 or that 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=96867065&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=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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