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Stock-Based Compensation Plans - Summarizes Transactions of SEUs (Detail) - Stock Equivalent Units [Member] | 12 Months Ended
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Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Outstanding, Number of SEUs, Beginning balance | shares | 400,342
Granted at discount, Number of SEUs | shares | 115,229
Granted at market value, Number of SEUs | shares | 5,658
Exercised, Number of SEUs | shares | (78,239)
Forfeited, Number of SEUs | shares | (24,054)
Outstanding, Number of SEUs, Ending balance | shares | 418,936
Outstanding, Weighted Average Exercise Price, Beginning balance | $ 3.10
Granted at discount, Weighted Average Exercise Price | 2.36
Granted at market value, Weighted Average Exercise Price | 68.20
Exercised, Weighted Average Exercise Price | 5.40
Forfeited, Weighted Average Exercise Price | 0.96
Outstanding, Weighted Average Exercise Price, Ending balance | 3.47
Outstanding, Weighted Average Grant-Date Fair Value | 46.65
Granted at discount, Weighted Average Grant-Date Fair Value | 57.16
Granted at market value, Weighted Average Grant-Date Fair Value | 16.23
Exercised, Weighted Average Grant-Date Fair Value | 30.44
Forfeited, Weighted Average Grant-Date Fair Value | 41.58
Outstanding, Weighted Average Grant-Date Fair Value | $ 52.45

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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 Share based compensation arrangement by share based payment award equity instruments other than options vested options exercised 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 other than options grants in period at discount. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award other than options grants in period market value. + References No definition available. + Details
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- Definition Share Based Compensation Arrangements By Share Based Payment Award Other Than Options Grants In Period at Discount Gross 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=109197908&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://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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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=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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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