Common Stock Option, Shares

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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 annual maximum total return

+ References

No definition available.

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- Definition

Percentage of shareholder return annually

+ References

No definition available.

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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 on a prorated basis

+ References

No definition available.

+ Details

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- Definition

Percentage of shareholder return to be earned

+ References

No definition available.

+ Details

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- Definition

Percentage of superior performance awards were deemed forfeited

+ References

No definition available.

+ Details

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- Definition

Percentage of superior performance awards will earned if we perform at or above fiftieth percentile

+ 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

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 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ 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.

+ 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.

+ References

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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.

+ References

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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.

+ References

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- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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- Definition

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

+ References

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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.

+ References

+ Details

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-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.

+ References

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- Definition

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

+ References

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- Definition

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

+ 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

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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).

+ References

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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.

+ References

+ Details

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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.

+ References

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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

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: 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 3: 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

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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.

+ References

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Stock Awards - Additional Information (Detail) (USD $)	12 Months Ended					3 Months Ended	12 Months Ended
Stock Awards - Additional Information (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Maximum	Dec. 31, 2011 Settled in Cash	Dec. 31, 2012 2010 Performance Awards	Dec. 31, 2012 2010 Performance Awards	Dec. 31, 2010 2010 Performance Awards Y	Dec. 31, 2012 Core Performance Awards	Dec. 31, 2007 Core Performance Awards	Dec. 31, 2010 Superior Performance Awards	Dec. 31, 2012 Service-Based Awards Maximum	Dec. 31, 2012 Service-Based Awards Minimum	Dec. 31, 2012 2012 Performance Awards	Dec. 31, 2012 2011 Performance Awards	Dec. 31, 2011 30% Of 2011 Performance Awards Y	Dec. 31, 2011 18% Of 2011 Performance Awards	Dec. 31, 2011 18% Of 2011 Performance Awards Maximum	Dec. 31, 2011 18% Of 2011 Performance Awards Minimum	Dec. 31, 2011 18% Of 2011 Performance Awards If any shares are earned from this award	Dec. 31, 2011 Remaining % Of 2011 Performance Awards	Dec. 31, 2011 Remaining % Of 2011 Performance Awards If any shares are earned from this award	Dec. 31, 2012 30% of 2012 Performance Awards Y	Dec. 31, 2012 35% of 2012 Performance Awards	Dec. 31, 2012 35% of 2012 Performance Awards Maximum	Dec. 31, 2012 35% of 2012 Performance Awards Minimum	Dec. 31, 2012 35% of 2012 Performance Awards If any shares are earned from this award	Dec. 31, 2012 Remaining % of 2012 Performance Awards	Dec. 31, 2012 Remaining % of 2012 Performance Awards If any shares are earned from this award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved shares of common stock for awards under the Equity Incentive Plan	7,441,180
Common stock remaining for future stock awards	1,489,812
Maximum number of shares of common stock that may be awarded	1,000,000
Stock award vesting period (in years)				10 years						7 years	3 years
Number of stock options outstanding	60,000
Number of stock options exercisable	60,000
Stock options, weighted-average exercise price	$ 10.00
Stock options, intrinsic value of options exercisable and outstanding	$ 0
Stock options forfeited	50,000
Number of stock options settled for cash					20,000
Stock options awarded, weighted average remaining contractual term (in years)	1 year 7 months 6 days
Stock award required service period (in years)												7 years	3 years
Share based payment award, expected volatility rate								42.00%								33.00%	34.00%				34.00%		34.00%	35.00%				35.00%
Stock-based awards expiration date								Dec. 31, 2014								Dec. 31, 2015							Dec. 31, 2016
Share base payment award, weighted average risk-free rate of return								2.60%								2.07%	1.07%				1.07%		0.93%	0.43%				0.43%
Common stock options awarded, dividend yield								8.50%								8.50%	8.50%				8.50%		8.60%	8.60%				8.60%
Percentage of performance award grant in period																30.00%	18.00%						30.00%	35.00%
Percentage of shareholder return annually								9.50%		9.00%						9.00%							9.00%
Percentage of shareholder return annually achieving period (in years)								3								3							3
Share-based compensation arrangement by share based payment award, expected term (in years)								4 years								4 years	5 years				5 years		4 years	5 years				5 years
Percentage of performance award to be earned of shareholder return reaches shareholder limit																	100.00%				100.00%			100.00%				100.00%
Share-based compensation award vesting rights																				Vest in equal annual amounts on January 1, 2014, 2015 and 2016		Vest in equal annual amounts on January 1, 2014, 2015 and 2016					Vest in equal annual amounts on January 1, 2015, 2016 and 2017		Vest in equal annual amounts on January 1, 2015, 2016 and 2017
Percentage of shareholder return to be earned																		39.00%	27.00%		12.00%				35.00%	27.00%		6.00%
Number of performance awards earned							121,733	60,866	79,283					92,094	147,256
Number of performance awards to be earned									317,143					804,547	684,851
Stock based compensation expense	7,600,000	7,000,000	6,600,000			400,000
Percentage of shareholder return on a pro-rated basis										7.50%
Percentage of shareholder annual maximum total return										9.00%
Percentage of superior performance awards will earned if we perform at or above fiftieth percentile			33.334%
Percentage of superior performance awards were deemed forfeited			66.666%
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	$ 6,100,000	$ 6,100,000