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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, 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 | (142,035)
Forfeited, Number of SEUs | shares | (14,259)
Outstanding, Number of SEUs, Ending balance | shares | 390,816
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 | 2.22
Forfeited, Weighted Average Exercise Price | 3.42
Outstanding, Weighted Average Exercise Price, Ending balance | 3.69
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 | 46.45
Forfeited, Weighted Average Grant-Date Fair Value | 63.76
Outstanding, Weighted Average Grant-Date Fair Value | $ 59.91

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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 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 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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