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Shareholders' Equity - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 10, 2017 | May 16, 2017 | Jan. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 13, 2012
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock Dividend Reinvestment Plan |  |  |  | 100,000,000 | 100,000,000 | 100,000,000 |  |
Number of stock option granted |  | 0 |  |  | 128,000 | 105,000 | 286,000 |
Number of performance-based awards outstanding |  |  |  | 53,000 |  | 53,000 |  |
Number of performance-based awards forfeited |  |  |  |  | 53,000 |  |  |
Share-based compensation expense |  |  |  |  | $ 1,700,000 | $ 2,200,000 | $ 1,900,000 |
Tax benefit related to stock based compensation expense |  |  |  |  | $ 0 | 200,000 | 0 |
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 |  |  |  |  | 1,400,000 |  |  |
Discount from market price |  |  |  |  | 15.00% |  |  |
Employees offering dates intervals |  |  |  |  | 6 months |  |  |
Employee stock purchase plan expense |  |  |  |  | $ 83,000 | $ 71,000 | $ 54,000 |
Weighted-average fair value of stock options granted |  |  |  |  | $ 2.68 | $ 2.07 | $ 4.35 |
Expected Volatility Rate |  |  |  |  | 39.00% | 39.00% | 44.00% |
Expected Term Period |  |  |  |  | 6 years 3 months 18 days | 6 years 6 months | 6 years 3 months 18 days |
Risk-Free Interest Rate |  |  |  |  | 2.20% | 2.10% | 1.90% |
Expected dividend rate |  |  |  |  | 3.30% | 3.60% | 2.40% |
Cash received from employee stock option exercised |  |  |  |  | $ 1,100,000 | $ 1,300,000 | $ 100,000 |
Intrinsic value of option exercised |  |  |  |  | $ 2,600,000 | $ 1,000,000 | $ 200,000 |
Warrants issued to acquire Icarus Share |  |  |  |  | 250,000 |  |  |
Warrants exercise price |  |  |  |  | $ 9.07 |  |  |
Warrants expiration date |  |  |  |  | Dec. 26, 2016 |  |  |
Common stock, shares issued |  |  |  | 34,300,209 | 34,707,924 | 34,300,209 |  |
Warrant outstanding |  |  |  | 0 | 0 | 0 |  |
Aggregate value transaction value of share purchased |  |  |  |  |  | $ 1,238,000 |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  | 89,640 |  | 89,640 |  |
Shares issued, price per share |  |  |  | $ 9.07 |  | $ 9.07 |  |
Share purchased |  |  |  |  | 0 | 105,000 | 0 |
Aggregate value transaction value of share purchased |  |  |  |  |  | $ 1,000 |  |
Common Stock [Member] | Former Owner of Subsidiary Acquired [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share purchased |  |  |  |  |  | 30,000 |  |
Aggregate value transaction value of share purchased |  |  |  |  |  | $ 200,000 |  |
Common Stock [Member] | Current Segment President [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share purchased |  |  |  | 75,000 |  | 75,000 |  |
Aggregate value transaction value of share purchased |  |  | $ 1,100,000 |  |  |  |  |
Performance Units [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
2017 stock options or stock awards, vesting period | 3 years |  |  |  |  |  |  |
Maximum shares of common stock participant could receive per performance | 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 |  |  |  |  |  |  |
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 |  |  |  |  | $ 5,000,000 |  |  |
Weighted average vesting period |  |  |  |  | 2 years 8 months 12 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 |  |  |  |  | 2,000,000 |  |  |
Number of stock option granted |  |  |  |  | 128,000 |  |  |
Number of restricted stock awards granted |  |  |  |  | 351,000 |  |  |
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] |  |  |  |  |  |  |  |
Shares available for future grant |  |  |  | 414,000 |  | 414,000 |  |
Number of stock option granted |  |  |  |  | 0 | 105,000 |  |
Number of restricted stock awards granted |  |  |  |  | 54,000 | 267,000 |  |
Number of shares reserved for issuance |  |  |  | 3,300,000 |  | 3,300,000 |  |
2007 Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
2017 stock options or stock awards, vesting period |  |  |  |  | 4 years |  |  |
2007 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
2017 stock options or stock awards, vesting period |  |  |  |  | 5 years |  |  |
2007 Plan [Member] | Employee Stock Option [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
2017 stock options or stock awards, vesting period |  |  |  |  | 3 years |  |  |
2007 Plan [Member] | Employee Stock Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
2017 stock options or stock awards, vesting period |  |  |  |  | 5 years |  |  |
2007 Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of stock awards granted |  |  |  |  | 405,000 |  |  |
Weighted-average fair value of restricted stock awards granted |  |  |  |  | $ 9.88 | $ 9.76 | $ 9.48 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average expected volatility rate 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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