The aggregate amount of quarterly Director compensation to be paid upon successful emergence from Chapter 11.

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Fair value of annual restricted stock grants made to independent directors.

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No definition available.

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For grant awards vesting in less than one year, the period of time during which transfers of common stock are restricted.

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No definition available.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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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.

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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

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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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)
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-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=96867065&loc=d3e5070-113901

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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).

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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.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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Number of options outstanding, including both vested and non-vested options.

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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

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=96867065&loc=d3e5070-113901

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share-Based Payments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2016	Dec. 31, 2014
Share-based compensation Arrangement
Share-based compensation expense	$ 2,100,000	$ 3,600,000	$ 1,300,000
2006 Incentive Plan
Share-based compensation Arrangement
Shares available for grant under the incentive plan	0
2015 Equity Plan
Share-based compensation Arrangement
Shares authorized under the incentive plan	1,900,000
Shares available for grant under the incentive plan	861,222
Unvested restricted stock	59,198
Director Compensation Program
Share-based compensation Arrangement
Aggregate grant date fair value per nonexecutive director			$ 75,000	$ 85,000
Aggregate amount of quarterly Director compensation to be paid upon successful emergence from Chapter 11	$ 40,000
Stock Appreciation Rights \| 2006 Incentive Plan
Share-based compensation Arrangement
Shares outstanding	0
Restricted Common Stock Awards
Share-based compensation Arrangement
Unvested restricted stock	632,992	597,246	259,323		114,505
For grant awards vesting in less than one year, the period of time during which transfers of common stock are restricted	1 year
Share-based compensation expense	$ 1,700,000	$ 1,600,000	$ 800,000
Unrecognized share-based compensation expense	$ 2,100,000
Shares granted	417,720	527,889	255,151
Options exercisable weighted average remaining contractual life (in years)	1 year 9 months 18 days
Restricted Common Stock Awards \| Employees
Share-based compensation Arrangement
Shares granted	183,447	109,207	32,412
Restricted Common Stock Awards \| Executive Officers
Share-based compensation Arrangement
Shares granted	132,354	355,166	172,529
Restricted Common Stock Awards \| Directors
Share-based compensation Arrangement
Shares granted	101,919	63,516	50,210
Restricted Common Stock Awards \| Maximum
Share-based compensation Arrangement
Awards, vesting period	5 years
Restricted Common Stock Awards \| 2015 Equity Plan
Share-based compensation Arrangement
Unvested restricted stock	573,794
Common Stock Options
Share-based compensation Arrangement
Shares outstanding	0	0			81,400
Fully vested and exercisable common stock options outstanding	367,600	748,150	775,650		986,300
Share-based compensation expense	$ 0	$ 0	$ 100,000
Unrecognized share-based compensation expense	$ 0
Options exercisable weighted average remaining contractual life (in years)	2 years 10 months 24 days
Common Stock Options \| 2006 Incentive Plan
Share-based compensation Arrangement
Fully vested and exercisable common stock options outstanding	367,600
Option awards granted	0	0	0
Common Stock Options \| 2006 Incentive Plan \| Minimum
Share-based compensation Arrangement
Common stock option expiration term	8 years
Common Stock Options \| 2006 Incentive Plan \| Maximum
Share-based compensation Arrangement
Awards, vesting period	4 years
Common stock option expiration term	10 years
Restricted Stock Units
Share-based compensation Arrangement
Unvested restricted stock	209,654	354,058	260,000
Awards, vesting period	3 years
Share-based compensation expense	$ 200,000	$ 1,600,000	$ 400,000
Unrecognized share-based compensation expense	$ 600,000
Unrecognized share-based compensation expense weighted average contractual term	1 year 10 months 24 days
Shares granted	165,777	121,823	260,000
Restricted Stock Units \| Directors
Share-based compensation Arrangement
Unvested restricted stock	31,323
Share-based compensation expense	$ 200,000
Shares granted	67,972
Restricted Stock Units \| 2015 Equity Plan
Share-based compensation Arrangement
Unvested restricted stock	209,654
Restricted Stock Units \| 2015 Equity Plan \| Directors
Share-based compensation Arrangement
Shares outstanding	31,323