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Stockholders' Equity - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2006 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stockholders Equity [Line Items] |  |  |  |
Exercise price of Options |  | $ 28.13 |  |
Stock option plans, options outstanding |  | 842,780 | 955,848 |
Income tax benefit from compensation expense |  | $ 662,000 | $ 302,000 | $ 175,000
Term of historical volatility of common stock |  | 6 years |  |
Number of shares converted |  | 6,400,000 |  |
Discontinued Operations [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Stock option plans, options outstanding |  | 211,025 |  |
Income tax benefit from compensation expense |  | $ 244,000 | $ 445,000 | $ 426,000
2015 Restricted Stock [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Shares grant from treasury stock |  | 584,959 |  |
Restricted stock, vesting percentage |  | 33.33% |  |
Restricted stock, vesting period |  | 3 years |  |
Restricted stock, fair value |  | $ 4,200,000 |  |
Restricted stock, fair value per share |  | $ 7.18 |  |
Income tax benefit from compensation expense |  | $ 156,000 |  |
2015 Restricted Stock [Member] | Selling, General And Administrative Expenses [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Share-based compensation expense |  | $ 405,000 |  |
Preferred Share Rights Plan [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Preferred share right plan description |  | If a person or group acquires 15% or more of our common stock, each Right will entitle the holder (other than the person or group that triggered the Rights being exercisable) to purchase shares of our common stock (or, in certain circumstances, cash or other securities) having a market value of twice the exercise price of a Right at such time. |  |
Minimum percentage of ownership of common stock required to exercise preferred share rights |  | 15.00% |  |
Exercise price of Preferred Stock |  | $47.75 per one one-hundredth of a share |  |
Redemption price preferred share rights |  | $ 0.01 |  |
Maximum time for redemption after the Rights become exercisable |  | 10 days |  |
Preferred share right exchange ratio |  | 1 |  |
Minimum percentage of beneficial ownership of common stock to end preferred share rights exchange |  | 50.00% |  |
2008 Plan [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Number of common stock shares for issuance |  | 1,975,000 | 1,975,000 |
Minimum exercise price of stock option at grant date |  | No less than 100% of the fair market value, as defined in the 2008 Plan, of the shares on the date of grant. |  |
Percentage of fair market value |  | 100.00% |  |
Maximum term of stock option |  | 10 years |  |
Stock option plans, options outstanding |  | 802,780 |  |
Total stock based compensation expense not yet recognized, relating to non-vested restricted stock options |  | $ 11,626,000 |  |
2008 Plan [Member] | Discontinued Operations [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Total stock based compensation expense not yet recognized, relating to non-vested restricted stock options |  | $ 2,027,000 |  |
2008 Plan [Member] | 2015 Stock Options [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Number of shares of stock options granted |  | 135,000 |  |
Options vest at a percentage rate for first 5 years |  | 16.50% |  |
Options final year vesting |  | End of the sixth year |  |
2008 Plan [Member] | 2015 Stock Options [Member] | Discontinued Operations [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Number of shares of stock options granted |  | 5,000 |  |
2008 Plan [Member] | 2014 Stock Options [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Number of shares of stock options granted |  |  | 489,000 |
Options vest at a percentage rate for first 5 years |  | 16.50% |  |
Options final year vesting |  | End of the sixth year |  |
2008 Plan [Member] | 2014 Stock Options [Member] | Discontinued Operations [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Number of shares of stock options granted |  |  | 119,000 |
2006 Options [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Number of shares of stock options granted | 450,000 |  |  |
Exercise price of Options | $ 8.01 |  |  |
Stock option plans, options outstanding | 40,000 |  |  |
Stock options plan, options Exercisable | 20,000 |  |  |

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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=6415400&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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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://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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -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 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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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