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Stock Compensation Plans - Additional Information (Detail) - USD ($) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Jan. 02, 2019 | Jan. 02, 2018 | Jan. 03, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2015 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Compensation expense in stock compensation plans |  |  |  |  | $ 1,400,000 | $ 1,700,000 | $ 2,000,000 |  |
Income tax benefit of stock compensation plans |  |  |  |  | 288,901 | 354,412 | 692,164 |  |
Unrecognized compensation expense related to nonvested share-based compensation granted under the plan |  |  |  |  | $ 2,000,000 | 2,500,000 |  |  |
Weighted average period of unrecognized compensation expense |  |  |  |  | 1 year 10 months 24 days |  |  |  |
Cash from option exercises |  |  |  |  | $ 2,900,000 | 1,100,000 | 13,400,000 |  |
Tax benefit for tax deductions from option exercises |  |  |  |  | $ 64,765 | $ 25,938 | $ 873,515 |  |
Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Exercisable period of stock options |  |  |  |  | 5 years |  |  |  |
Restricted shares issued to directors |  |  |  |  | 500 |  |  |  |
Weighted-average grant date fair value of options granted |  |  |  |  | $ 1.15 | $ 1.66 | $ 1.81 |  |
Fair value of risk-free interest rate |  |  |  |  | 1.64% | 2.68% | 2.01% |  |
Expected life |  |  |  |  | 3 years | 3 years | 3 years |  |
Expected volatility |  |  |  |  | 17.00% | 22.00% | 19.00% |  |
Expected dividend yield |  |  |  |  | 4.00% | 4.00% | 3.00% |  |
Shares available for future option grants |  |  |  |  | 4.0 |  |  |  |
Equity Incentive Plan [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock available for issuance to employees of subsidiaries and affiliates under identical plan |  |  |  |  | 4,500,000 |  |  |  |
Common stock available for issuance to directors and those of the subsidiaries and affiliates under identical plan |  |  |  |  | 500,000 |  |  |  |
Equity Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Additional issued shares |  | 8,500 | 8,500 | 9,000 |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Exercisable period of stock options |  |  |  |  | 10 years |  |  |  |
Common stock available for issuance to employees/directors and those of the subsidiaries and affiliates |  |  |  |  |  |  |  |  | 300,000
Percentage of purchase price of shares |  |  |  |  | 85.00% | 85.00% |  |  |
Employee Stock Purchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Additional issued shares | 20,424 |  |  |  |  |  |  |  |
Shares issued during period price per share | $ 12.28 |  |  |  |  |  |  |  |
Agency Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Additional issued shares |  |  |  |  | 110,836 | 117,935 | 104,418 |  |
Common stock available for issuance to employees/directors and those of the subsidiaries and affiliates |  |  |  |  |  |  |  | 350,000 |
Percentage of purchase price of shares |  |  |  |  | 90.00% |  |  |  |
Investment |  |  |  |  | $ 12,000 |  |  |  |
Number of trading days of subscription period |  |  |  |  | 10 days |  |  |  |
2019 Amendment Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock available for issuance to employees/directors and those of the subsidiaries and affiliates |  |  |  |  | 500,000 |  |  |  |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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