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Shareholders' Equity - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 09, 2016 | Aug. 13, 2012
Class of Stock [Line Items] |  |  |  |  |  |
Dividend payable date | Mar. 31, 2016 |  |  |  |  |
Dividend recorded date | Mar. 19, 2016 |  |  |  |  |
Issuance of common stock Dividend Reinvestment Plan | 100,000,000 | 100,000,000 |  |  |  |
Number of stock option granted | 286,000 | 280,000 | 923,000 |  |  |
Number of performance-based awards outstanding | 53,000 |  |  |  |  |
Share-based compensation expense | $ 1,900,000 | $ 1,700,000 | $ 1,100,000 |  |  |
Tax benefit related to stock based compensation expense | 0 | 200,000 | 300,000 |  |  |
Equity compensation expense capitalized in inventory or fixed assets | $ 0 |  |  |  |  |
Number of shares authorized in employee stock purchase plan | 1,500,000 |  |  |  |  |
Employee stock purchase plan period | 10 years |  |  |  |  |
Discount from market price | 15.00% |  |  |  |  |
Employees offering dates intervals | 6 months |  |  |  |  |
Employee stock purchase plan expense |  | 54,000 | 19,000 | $ 19,000 |  |
Contributions to the employees' stock ownership trust in cash |  | $ 0 | $ 0 | $ 0 |  |
Contributions to the employees' stock ownership trust in shares |  | 0 | 0 | 0 |  |
Weighted-average fair value of stock options granted | $ 4.35 | $ 6.48 | $ 6.18 |  |  |
Expected Volatility Rate | 44.00% | 55.00% | 57.00% |  |  |
Expected Term Period | 6 years 3 months 18 days | 6 years 3 months 18 days | 6 years 6 months |  |  |
Risk-Free Interest Rate | 1.90% | 2.20% | 2.20% |  |  |
Expected dividend rate | 2.40% | 1.70% | 1.60% |  |  |
Cash received from employee stock option exercised | $ 100,000 | $ 1,200,000 | $ 1,400,000 |  |  |
Intrinsic value of option exercised | $ 200,000 | $ 2,400,000 | 2,700,000 |  |  |
Warrants issued to acquire Icarus Share | 250,000 |  |  |  |  |
Warrants exercise price | $ 9.07 |  |  |  |  |
Warrants expiration date |  | Dec. 26, 2016 |  |  |  |
Aggregate value transaction value of share purchased |  | $ 973,000 | $ 2,365,000 |  |  |
Market price per share |  |  | $ 13.14 |  |  |
Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share purchased | 0 | 61,500 | 180,000 |  |  |
Aggregate value transaction value of share purchased |  | $ 1,000 | $ 2,000 |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Unrecognized compensation expense related to stock options and restricted stock | $ 7,200,000 |  |  |  |  |
Weighted average vesting period | 3 years 1 month 6 days |  |  |  |  |
Dividend Reinvestment Plan [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock Dividend Reinvestment Plan |  |  |  |  |  | 750,000
2007 Plan [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of stock option granted | 286,000 | 280,000 |  |  |  |
Number of restricted stock awards granted | 323,000 | 6,000 |  |  |  |
Number of shares reserved for issuance | 3,300,000 |  |  |  |  |
Shares available for future grant | 511,000 |  |  |  |  |
2007 Plan [Member] | Non Employee Stock Option [Member] | Minimum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
2007 stock options or stock awards, vesting period | 1 year |  |  |  |  |
2007 Plan [Member] | Non Employee Stock Option [Member] | Maximum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
2007 stock options or stock awards, vesting period | 3 years |  |  |  |  |
2007 Plan [Member] | Employee Stock Option [Member] | Minimum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
2007 stock options or stock awards, vesting period | 3 years |  |  |  |  |
2007 Plan [Member] | Employee Stock Option [Member] | Maximum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
2007 stock options or stock awards, vesting period | 5 years |  |  |  |  |
2007 Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Restricted stock awards outstanding | 323,000 | 6,000 | 0 | 0 |  |
Awards Subject to Service Requirements [Member] | Employee Stock Option [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
2007 stock options or stock awards, vesting period | 4 years |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Quarterly dividend declared per share |  |  |  |  | $ 0.066 |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the 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 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition This item represents the amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Definition This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + 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://www.xbrl.org/2003/role/presentationRef -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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(1)(i) -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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -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 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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