Common Stock Option, Shares

No definition available.

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- Definition

Percentage of performance award grant in period

+ References

No definition available.

+ Details

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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

+ 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

Share Based Compensation Arrangement by Share Based Payment Award, Options, Exchanged

+ 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

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-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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-Paragraph 2

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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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-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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-Topic 718

-SubTopic 10

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-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

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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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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (f)(2)(iv)

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- Definition

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

+ References

+ 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).

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-Paragraph 2

-Subparagraph (a)(3)

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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

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.

+ 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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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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.

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-Name Accounting Standards Codification

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-SubTopic 10

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-Paragraph 2

-Subparagraph (c)(1)(iii)

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 2

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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

Weighted average remaining contractual term of exercisable stock options, 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 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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-Topic 505

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-Section S99

-Paragraph 1

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-Section S99

-Paragraph 1

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Stock Awards - Additional Information (Detail) (USD $)	12 Months Ended
Stock Awards - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options outstanding	20,000
Number of stock options exercisable	20,000
Stock options, weighted-average exercise price	$ 10.00
Stock options, intrinsic value of options exercisable and outstanding	$ 0
Stock options exercised	40,000
Stock options awarded, weighted average remaining contractual term (in years)	3 months 18 days
Number of performance awards earned and vested	68,086
Number of performance awards to be earned	686,169
Stock-based compensation expense	8,900,000	7,600,000	7,000,000
Stock-based compensation expense, unrecognized cost	10,100,000
Stock-based compensation expense, unrecognized cost, reorganization period (in years)	2 years 6 months
Restricted equity awards, fair value	$ 9,200,000	$ 9,200,000	$ 6,100,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award vesting period (in years)	10 years
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] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned		27.00%
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%
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
30% of 2011 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate			33.00%
Stock-based awards expiration date			Dec. 31, 2015
Share based payment award, weighted average risk-free rate of return			2.07%
Common stock options awarded, dividend yield			8.50%
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
18% of 2011 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate			34.00%
Share based payment award, weighted average risk-free rate of return			1.07%
Common stock options awarded, dividend yield			8.50%
Percentage of performance award grant in period			18.00%
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%
18% of 2011 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, 2014, 2015 and 2016
18% of 2011 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%
18% of 2011 Performance Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned			39.00%
Remaining % of 2011 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based payment award, expected volatility rate			34.00%
Share based payment award, weighted average risk-free rate of return			1.07%
Common stock options awarded, dividend yield			8.50%
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			12.00%
Remaining % of 2011 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, 2014, 2015 and 2016
Settled in Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options settled for cash			20,000
Stock options granted	0	0	0
Stock options exercised	0	0	0
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
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
27% of 2013 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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
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	7,643,651
Maximum number of shares of common stock that may be awarded	5,000,000
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] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shareholder return to be earned	25.50%
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%
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
2012 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance awards earned and vested	84,188	84,188
Number of performance awards to be earned	725,666
Number of performance awards forfeited	2,599	5,718
2011 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance awards earned and vested	81,359	155,162	0
Number of performance awards forfeited	8,062	14,456
Number of performance awards to be earned	587,344