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Shareholders' Equity - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 10, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 16, 2017 | Aug. 13, 2012
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock dividend reinvestment plan |  | 100,000,000 | 100,000,000 |  |  |
Number of stock option granted |  |  |  | 128,000 |  |
Share-based compensation expense |  | $ 2,700,000 | $ 3,100,000 | $ 1,700,000 |  |
Tax benefit related to stock based compensation expense |  | $ 400,000 | 500,000 | 0 |  |
Discount from market price |  | 15.00% |  |  |  |
Employees offering dates intervals |  | 6 months |  |  |  |
Number of shares authorized in employee stock purchase plan |  | 1,500,000 |  |  |  |
Employee stock purchase plan period |  | 10 years |  |  |  |
Employee stock purchase plan number of shares remain available for future issuance |  | 1,300,000 |  |  |  |
Employee stock purchase plan expense |  | $ 60,000 | 90,000 | $ 83,000 |  |
Estimated weighted-average fair value of stock options granted |  |  |  | $ 2.68 |  |
Expected volatility rate |  |  |  | 39.00% |  |
Expected term period |  |  |  | 6 years 3 months 18 days |  |
Risk-free interest rate |  |  |  | 2.20% |  |
Expected dividend rate |  |  |  | 3.30% |  |
Cash received from employee stock option exercised |  | 7,000,000 | 100,000 | $ 1,100,000 |  |
Intrinsic value of option exercised |  | 300 | $ 24,000,000 | $ 2,600,000 |  |
Performance Units [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Maximum shares of common stock participant could receive upon vesting | 77,778 |  |  |  |  |
Common stock price threshold consecutive trading days | 30 days |  |  |  |  |
Period to earn units based on stock price during thirty consecutive trading days | 2 years |  |  |  |  |
Performance Units [Member] | Chief Executive Officer [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
2017 stock options or stock awards, vesting period | 3 years |  |  |  |  |
Number of stock awards granted | 700,000 |  |  |  |  |
Fair value of stock awards granted | $ 175,000 |  |  |  |  |
Restricted Stock and Performance Units [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Unrecognized compensation expense related to stock options and restricted stock |  | $ 6,400,000 |  |  |  |
Weighted average vesting period |  | 2 years 1 month 6 days |  |  |  |
Dividend Reinvestment Plan [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock dividend reinvestment plan |  |  |  |  |  | 750,000
2017 Plan [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares available for future grant |  | 900,000 |  |  |  |
2017 Plan [Member] | Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  | 1,900,000 |
2017 Plan [Member] | Minimum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
2017 stock options or stock awards, vesting period |  | 3 years |  |  |  |
2017 Plan [Member] | Maximum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
2017 stock options or stock awards, vesting period |  | 4 years |  |  |  |
2017 Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
2017 stock options or stock awards, vesting period |  | 4 years |  |  |  |
2007 Plan [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of stock option granted |  | 0 |  |  |  |

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- Definition The number of grants made 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=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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