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Stock-Based Compensation - Stock Options Outstanding Roll Forward (Detail) - Equity Option [Member] - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding at December 31, 2017 | 2,039 |  |
Granted | 321 | 389 | 324
Exercised | (433) |  |
Canceled | (137) |  |
Outstanding at December 31, 2018 | 1,790 | 2,039 |
Weighted-average exercise price of options outstanding at beginning of period | $ 124.41 |  |
Weighted-average exercise price of options granted | 196.78 | $ 170.24 | $ 135.02
Weighted-average exercise price of options exercised | 102.92 |  |
Weighted average exercise price of options canceled | 125.93 |  |
Weighted-average exercise price of options outstanding at end of period | 142.47 | 124.41 |
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 | 188.26 |  |
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 | 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 | 154.33 |  |
Weighted-average exercise price of options outstanding at end of period | $ 208.47 | $ 194.26 |

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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://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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- 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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- 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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