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Stockholders' Equity - Stock Option Activities of Long-Term Incentive and Option Plans (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016
Stockholders Equity [Line Items] |  |  |  |
Shares outstanding at beginning of year | 124,000 |  |  |
Cancelled, forfeited or expired, Shares | (2,000) |  |  |
Shares outstanding at end of year | 122,000 | 124,000 |  |
Shares exercisable at end of year | 122,000 |  |  |
Outstanding at beginning of year, Weighted-Average Exercise Price | $ 33.86 |  |  |
Forfeited or expired, Weighted-Average Exercise Price | 34.50 |  |  |
Outstanding at end of year, Weighted-Average Exercise Price | 33.85 | $ 33.86 |  |
Exercisable at end of year, Weighted-Average Exercise Price | $ 33.85 |  |  |
Stock-based compensation expense - Cost of sales | $ 106,000 | $ 122,000 | $ 141,000 |
Stock-based compensation expense - SG&A | 42,000 | 50,000 | 71,000 |
Income tax benefit | (36,000) | (42,000) | (54,000) |
Total fair value of options vested during the year | $ 180,000 | $ 169,000 | $ 169,000 |
Total weighted-average remaining vesting period in years | 0 years | 5 months 26 days | 1 year 18 days |
Total weighted-average remaining contractual life period in years (options outstanding) | 2 years 7 months 20 days | 3 years 7 months 9 days | 4 years 7 months 9 days |
Total weighted-average remaining contractual life period in years (options exercisable) | 2 years 7 months 20 days | 3 years 5 months 19 days | 4 years 3 months 21 days |
2016 Plan [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Granted, Shares | 0 | 0 | 0 |
Maximum number of securities for issuance | 2,750,000 |  |  |
Number of awards available to be granted | 1,016,951 |  |  | 2,750,000
2016 Plan [Member] | Restricted Stock/Performance-Based Restricted Stock/Restricted Stock Units [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Number of unvested restricted stock/performance-based restricted stock/restricted stock units outstanding | 1,169,527 |  |  |
2008 Plan [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Shares outstanding at end of year | 122,000 |  |  |
Shares exercisable at end of year | 122,000 |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements with employees, directors and certain consultants qualifying for treatment as employees included in cost of sales. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements with employees, directors and certain consultants qualifying for treatment as employees included in SG&A. + References No definition available. + Details
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- Definition The weighted-average period between the balance sheet date and the dates when options outstanding will be fully vested, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + 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 (a)(3) -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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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested 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 -URI http://asc.fasb.org/extlink&oid=120381028&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)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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