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Share-based Compensation - Schedule of Changes in Time-Based, Performance-Based and Market-Based Restricted Stock Awards and Stock Units (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Time-based Restricted Stock Awards and Stock Units [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Outstanding at December 31, 2018 | 357,592 |  |
Granted (in shares) | 319,189 |  |
Vested and settled (in shares) | (157,053) |  |
Cancelled (in shares) | (51,000) |  |
Outstanding at December 31, 2019 | 468,728 | 357,592 |
Outstanding at December 31, 2018 | $ 49.77 |  |
Granted (in dollars per share) | 52.48 |  |
Vested and settled (in dollars per share) | 46.82 |  |
Cancelled (in dollars per share) | 52.85 |  |
Outstanding at December 31, 2019 | $ 51.96 | $ 49.77 |
Performance-based Restricted Stock Awards and Stock Units [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Outstanding at December 31, 2018 | 102,155 |  |
Granted (in shares) | 0 | 0 | 0
Vested and settled (in shares) | (102,155) |  |
Outstanding at December 31, 2019 |  | 102,155 |
Outstanding at December 31, 2018 | $ 33.12 |  |
Vested and settled (in dollars per share) | $ 33.12 |  |
Outstanding at December 31, 2019 |  | $ 33.12 |
Market-based Restricted Stock Units [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Outstanding at December 31, 2018 | 271,295 |  |
Granted (in shares) | 60,722 |  |
Cancelled (in shares) | (74,855) |  |
Outstanding at December 31, 2019 | 257,162 | 271,295 |
Outstanding at December 31, 2018 | $ 57.44 |  |
Granted (in dollars per share) | 65.27 |  |
Cancelled (in dollars per share) | 15.92 |  |
Outstanding at December 31, 2019 | $ 60.08 | $ 57.44 |

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- Definition Share based compensation arrangement by share based payment award equity Instruments other than options vested and settled in period + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options outstanding weighted average grant date fair value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options vested and settled in period weighted average grant Date fair value. + References No definition available. + Details
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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://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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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