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Stock-Based Compensation - Summary of Restricted Stock Unit and Performance Share Transaction (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Stock Units |  |  |
Restricted Stock Units |  |  |
Outstanding beginning balance (in shares) | 623,142 |  |
Granted (in shares) | 153,675 |  |
Distributed (vested) (in shares) | (194,373) |  |
Cancelled (in shares) | (10,231) |  |
Outstanding at end of period (in shares) | 572,213 | 623,142 |
Vested or expected to vest (in shares) | 572,213 |  |
Weighted Average Grant Date Fair Value |  |  |
Outstanding beginning balance (in dollars per share) | $ 92.54 |  |
Granted (in dollars per share) | 142.14 | $ 120.42 | $ 104.46
Outstanding ending balance (in dollars per share) | $ 109.31 | $ 92.54 |
Performance Shares |  |  |
Restricted Stock Units |  |  |
Outstanding beginning balance (in shares) | 1,455,054 |  |
Granted (in shares) | 389,384 |  |
Distributed (vested) (in shares) | (571,254) |  |
Cancelled (in shares) | (73,614) |  |
Outstanding at end of period (in shares) | 1,199,570 | 1,455,054 |
Vested or expected to vest (in shares) | 1,150,611 |  |
Weighted Average Grant Date Fair Value |  |  |
Outstanding beginning balance (in dollars per share) | $ 94.19 |  |
Granted (in dollars per share) | 132.94 | $ 119.99 | $ 97.92
Outstanding ending balance (in dollars per share) | $ 115.33 | $ 94.19 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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