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Share based compensation arrangement by award options and stock settled appreciation rights award expiration period.

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Share based payment award equity instruments other than options grants in period aggregate intrinsic value.

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Share based compensation arrangement by share based payment award options granted contractual term.

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No definition available.

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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.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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No definition available.

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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.

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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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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- Definition

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

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Name Accounting Standards Codification
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- Definition

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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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

Number of share options (or share units) exercised during the current period.

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Stock-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 31, 2015	Jan. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 4,620	$ 3,610	$ 2,973
Stock-based compensation, capitalized	195	$ 307	$ 130
Unrecognized compensation costs for all share-based payment arrangements	$ 4,821
Weighted-average grant date fair value of SARs	$ 3.40	$ 3.97	$ 3.31
Intrinsic value of SARs	$ 348
Common stock, shares issued	70,613,642	70,109,488
Time-Based Stock Appreciation Rights [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 2,194	$ 1,659	$ 1,412
Unrecognized compensation costs for all share-based payment arrangements	1,023
Performance-Based Stock Appreciation Rights [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs for all share-based payment arrangements	$ 2
Weighted-average grant date fair value of SARs	$ 3.32	$ 0	$ 2.52
Intrinsic value of SARs	$ 69
Stock-based compensation expense	21	$ 47	$ 247
Time-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs for all share-based payment arrangements	$ 1,891
Weighted-average grant date fair value of SARs	$ 6.63	$ 6.66
Stock-based compensation expense	$ 636	$ 592	357
Performance-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs for all share-based payment arrangements	$ 1,905
Weighted-average grant date fair value of SARs	$ 6.66	$ 6.41
Stock-based compensation expense	$ 1,124	$ 914	633
Performance-Based Restricted Stock Units [Member] \| First Quarter Two Thousand And Sixteen [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs for all share-based payment arrangements	538
Performance-Based Restricted Stock Units [Member] \| First Quarter Two Thousand And Seventeen [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs for all share-based payment arrangements	1,367
Performance Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 643	$ 398	$ 324
Maximum percentage of MPUs for senior executives	15.00%
Fair value period of MPUs	3 years
Market Performance Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term of MPUs	3 years
Common stock, shares issued				54,801	33,594
2006 LTIP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant	1,949,400
2006 LTIP [Member] \| SAR's [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option plan maximum term of period	10 years
Stock appreciation rights expiration period	10 years
2006 LTIP [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant	9,714,827
2014 Stock Option Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term of MPUs	10 years
2014 Stock Option Plan [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term of MPUs	4 years
2004 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option expiration period	10 years
Stock options granted	0	0	0
Intrinsic value of stock options exercised	$ 55
Number of stock options exercised	50,000
Weighted average exercise price of stock options	$ 4.88
Stock options outstanding	0
Stock options available for exercise	0