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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, 2017 | Dec. 31, 2016
Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options outstanding | 916,000 | 1,076,000
2010 Equity Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares authorized | 700,000 |
Shares Available to Issue | 38,000 |
2010 Equity Incentive Plan | RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares authorized | 240,000 |
Restricted share units outstanding | 10,000 | 16,000
2010 Equity Incentive Plan | Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options outstanding | 208,000 |
Restricted share units vesting period or option vesting period | 4 years |
2014 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares authorized | 950,000 |
Shares Available to Issue | 276,000 |
2014 Plan | Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of options vesting rights | 25.00% |
Performance metric period | 3 years |
Restricted share units vesting period or option vesting period | 4 years |
2014 Plan | Options | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of options vesting rights | 50.00% |
2014 Plan | 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 | 50.00% |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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 The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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