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Stock-Based Compensation Plans - Summarizes Transactions of SEUs (Detail) - Stock Equivalent Units [Member] | 9 Months Ended
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Sep. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Outstanding, Number of SEUs, Beginning balance | shares | 418,936
Granted at discount, Number of SEUs | shares | 123,815
Granted at market value, Number of SEUs | shares | 4,359
Exercised, Number of SEUs | shares | (131,496)
Forfeited, Number of SEUs | shares | (7,750)
Outstanding, Number of SEUs, Ending balance | shares | 407,864
Outstanding, Weighted Average Exercise Price, Beginning balance | $ 3.47
Granted at discount, Weighted Average Exercise Price | 0.00
Granted at market value, Weighted Average Exercise Price | 81.07
Exercised, Weighted Average Exercise Price | 2.40
Forfeited, Weighted Average Exercise Price | 2.24
Outstanding, Weighted Average Exercise Price, Ending balance | 3.61
Outstanding, Weighted Average Grant-Date Fair Value | 52.45
Granted at discount, Weighted Average Grant-Date Fair Value | 71.47
Granted at market value, Weighted Average Grant-Date Fair Value | 22.69
Exercised, Weighted Average Grant-Date Fair Value | 46.75
Forfeited, Weighted Average Grant-Date Fair Value | 58.08
Outstanding, Weighted Average Grant-Date Fair Value | $ 59.64

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options exercised in period weighted average exercise price. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options forfeited in period weighted average exercise price. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options grants in period at discount 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 grants in period market value 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 outstanding weighted average exercise price. + References No definition available. + 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 Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (c)(2)(i)-(ii) -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 non-option equity instruments exercised by participants. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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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