Percentage of performance award grant in period

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- Definition

Percentage of performance award to be earned of shareholder return reaches shareholder limit

+ References

No definition available.

+ Details

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- Definition

Percentage of shareholder return annually

+ References

No definition available.

+ Details

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- Definition

Percentage of shareholder return annually achieving period

+ References

No definition available.

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- Definition

Percentage of shareholder return to be earned

+ References

No definition available.

+ Details

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- Definition

Performance Based Award Share Amount Earned And Vested

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Not Earned In Period

+ References

No definition available.

+ Details

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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 50

-Paragraph 1

-Subparagraph (b)

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

Date the equity-based award expires, in CCYY-MM-DD format.

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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.

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-Publisher FASB

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-Section 50

-Paragraph 2

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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.

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

+ References

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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.

+ References

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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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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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- Definition

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

+ References

No definition available.

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- Definition

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

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- Definition

Number of options vested.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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Stock Awards - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options outstanding	0
Number of stock options exercisable	0
Stock options exercised	20,000
Stock options granted	0	0	0
Number of performance awards earned and vested	108,261
Number of performance awards to be earned	776,562
Stock-based compensation expense	$ 9.2	$ 8.8	$ 7.6
Stock-based compensation expense, unrecognized cost	12.4
Stock-based compensation expense, unrecognized cost, reorganization period (in years)	2 years 4 months 24 days
Restricted equity awards, fair value	$ 10.2	$ 9.2	$ 9.2
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period in years	10 years
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved shares of common stock for awards under the Equity Incentive Plan	7,643,651
Common stock remaining for future stock awards transferred to the equity incentive plan	6,316,151
Maximum number of shares of common stock that may be awarded	5,000,000
Service-Based Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award required service period (in years)	5 years
Service-Based Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award required service period (in years)	3 years
40% of 2014 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate	40.00%
Stock-based awards expiration date	Dec. 31, 2018
Share based payment award, weighted average risk-free rate of return	1.70%
Common stock options awarded, dividend yield	8.00%
Percentage of performance award grant in period	27.00%
Percentage of shareholder return annually	9.00%
Percentage of shareholder return annually achieving period (in years)	3
Share-based compensation arrangement by share based payment award, expected term (in years)	3 years
30% of 2014 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate	27.00%
Share based payment award, weighted average risk-free rate of return	0.80%
Common stock options awarded, dividend yield	8.00%
Percentage of performance award grant in period	30.00%
Share-based compensation arrangement by share based payment award, expected term (in years)	5 years
Percentage of performance award to be earned of shareholder return reaches shareholder limit	100.00%
30% of 2014 Performance Awards [Member] \| If any shares are earned from this award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights	Vest in equal annual amounts on December 31, 2016, 2017
30% of 2014 Performance Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned	35.00%
30% of 2014 Performance Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned	27.00%
Remaining % of 2014 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate	27.00%
Share based payment award, weighted average risk-free rate of return	0.80%
Common stock options awarded, dividend yield	8.00%
Share-based compensation arrangement by share based payment award, expected term (in years)	5 years
Percentage of performance award to be earned of shareholder return reaches shareholder limit	100.00%
Percentage of shareholder return to be earned	6.00%
Remaining % of 2014 Performance Awards [Member] \| If any shares are earned from this award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights	Vest in equal annual amounts on December 31, 2016, 2017 and 2018
27% of 2013 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period in years		2 years
Share based payment award, expected volatility rate		27.00%
Stock-based awards expiration date		Dec. 31, 2017
Share based payment award, weighted average risk-free rate of return		0.72%
Common stock options awarded, dividend yield		8.00%
Percentage of performance award grant in period		27.00%
Percentage of shareholder return annually		8.50%
Percentage of shareholder return annually achieving period (in years)		3
Share-based compensation arrangement by share based payment award, expected term (in years)		3 years
Number of shares sold under performance awards		0
36% of 2013 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate		28.00%
Share based payment award, weighted average risk-free rate of return		0.38%
Common stock options awarded, dividend yield		8.00%
Percentage of performance award grant in period		36.00%
Share-based compensation arrangement by share based payment award, expected term (in years)		5 years
Percentage of performance award to be earned of shareholder return reaches shareholder limit		100.00%
36% of 2013 Performance Awards [Member] \| If any shares are earned from this award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights		Vest in equal annual amounts on December 31, 2015, 2016 and 2017
36% of 2013 Performance Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned		33.50%
36% of 2013 Performance Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned		25.50%
Remaining % of 2013 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate		28.00%
Share based payment award, weighted average risk-free rate of return		0.38%
Common stock options awarded, dividend yield		8.00%
Share-based compensation arrangement by share based payment award, expected term (in years)		5 years
Percentage of performance award to be earned of shareholder return reaches shareholder limit		100.00%
Percentage of shareholder return to be earned		6.00%
Remaining % of 2013 Performance Awards [Member] \| If any shares are earned from this award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights		Vest in equal annual amounts on December 31, 2015, 2016 and 2017
30% of 2012 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate			34.00%
Stock-based awards expiration date			Dec. 31, 2016
Share based payment award, weighted average risk-free rate of return			0.93%
Common stock options awarded, dividend yield			8.60%
Percentage of performance award grant in period			30.00%
Percentage of shareholder return annually			9.00%
Percentage of shareholder return annually achieving period (in years)			3
Share-based compensation arrangement by share based payment award, expected term (in years)			4 years
35% of 2012 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate			35.00%
Share based payment award, weighted average risk-free rate of return			0.43%
Common stock options awarded, dividend yield			8.60%
Percentage of performance award grant in period			35.00%
Share-based compensation arrangement by share based payment award, expected term (in years)			5 years
Percentage of performance award to be earned of shareholder return reaches shareholder limit			100.00%
35% of 2012 Performance Awards [Member] \| If any shares are earned from this award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights			Vest in equal annual amounts on January 1, 2015, 2016 and 2017
35% of 2012 Performance Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			35.00%
35% of 2012 Performance Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			27.00%
Remaining % of 2012 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate			35.00%
Share based payment award, weighted average risk-free rate of return			0.43%
Common stock options awarded, dividend yield			8.60%
Share-based compensation arrangement by share based payment award, expected term (in years)			5 years
Percentage of performance award to be earned of shareholder return reaches shareholder limit			100.00%
Percentage of shareholder return to be earned			6.00%
Remaining % of 2012 Performance Awards [Member] \| If any shares are earned from this award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights			Vest in equal annual amounts on January 1, 2015, 2016 and 2017
2013 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance awards earned and vested	80,293	68,086
Number of performance awards to be earned	624,187
2012 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance awards earned and vested	84,190	84,188	84,188
Number of performance awards to be earned	641,476
Number of performance awards forfeited		2,599	5,718