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Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Summary of Equity-Based Compensation Plans with Grants Outstanding (Textual) (Detail) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock, shares authorized | 60,000,000 | 60,000,000
RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 2,584.37 |
Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options outstanding | 593,000 | 749,000
Options | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of options vesting rights | 25.00% |
2010 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares authorized | 700,000 |
Options outstanding | 74,000 |
Restricted share units outstanding | 14,000 |
Shares Available to Issue | 0 |
2010 Plan | RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted share units outstanding | 18,000 | 15,000
2014 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares authorized | 950,000 |
Shares Available to Issue | 126,000 |
2018 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares authorized | 275,000 |
Options outstanding | 116,000 |
Restricted share units outstanding | 4,000 |
Shares Available to Issue | 155,000 |
2018 Plan | RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares Available to Issue | 36,000 |
Common stock, shares authorized | 40,000 |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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