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

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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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.

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- Definition

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=56944662&loc=d3e3602-108585

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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.

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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).

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- Definition

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.

+ References

No definition available.

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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

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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).

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- Definition

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

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

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- Definition

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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- Definition

Number of non-vested options outstanding.

+ References

No definition available.

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Share-Based Payments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 01, 2016	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized under the incentive plan	1,900,000
Shares available for grant under the incentive plan	1,700,000	500,000
Aggregate grant date fair value per nonexecutive director	$ 75,000
Share-based compensation expense	$ 1,300,000	$ 1,000,000	$ 2,000,000
Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate grant date fair value per nonexecutive director				$ 85,000
Stock Appreciation Rights
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares outstanding	0	0
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares outstanding	0	0
Unvested restricted common stock options	259,323
Share-based compensation expense	$ 800,000	$ 700,000	$ 1,200,000
Unrecognized share-based compensation expense	$ 1,100,000
Unrecognized share-based compensation expense weighted average contractual term	2 years 1 month 6 days
Shares granted	255,151	73,394	139,005
Restricted Stock \| Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted	32,412	17,986	10,871
Restricted Stock \| Executive Officers
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted	172,529	27,500	25,000
Restricted Stock \| Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted	50,210	27,908	103,134
Restricted Stock \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted common stock awards, vesting period	5 years
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested restricted common stock options	260,000
Share-based compensation expense	$ 400,000
Unrecognized share-based compensation expense	$ 1,600,000	$ 1,600,000
Unrecognized share-based compensation expense weighted average contractual term	2 years
Shares granted	260,000
Performance Shares \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted common stock awards, vesting period	3 years
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares outstanding		81,400	673,833		872,373
Fully vested and exercisable common stock options	775,650	986,300	543,867		181,327
Share-based compensation expense	$ 100,000	$ 600,000	$ 900,000
Unrecognized share-based compensation expense	$ 0
Options exercisable weighted average remaining contractual life (in years)	5 years 4 months 24 days