Share Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012 Installments
Share Based Compensation (Textual) [Abstract]
General time period for exercisability of stock options	4
Stock Options [Member]
Share Based Compensation (Textual) [Abstract]
Stock option granted	657,821
Vesting period	Four equal annual installments beginning one year from the date of grant although they may become exercisable earlier in the event of death, disability, retirement or a change in control
Share-based compensation arrangement by share-based payment award fair value assumptions expected volatility calculation	50% weighting of our historical volatilities and 50% weighting of our implied volatilities
Share based compensation arrangement by share based payment award fair value assumptions historical expected volatility	50.00%
Share based compensation arrangement by share based payment award fair value assumptions implied expected volatility	50.00%
Expected volatility	58.45%
Risk-free rate	1.24%
Expected term (in years)	6.25
Expected dividends	0
Fair value of stock option granted	8.16
Expiration period for stock options	10 years
Restricted Stock Units [Member]
Share Based Compensation (Textual) [Abstract]
Vesting period	four equal annual installments beginning one year from the date of grant
Shares granted	464,721
Average fair value of shares granted	14.76
Performance Shares [Member]
Share Based Compensation (Textual) [Abstract]
Vesting period	after a three-year period based on our total stockholder return relative to the performance of the Dow Jones U.S. Construction and Materials Index, with adjustments to that index in certain circumstances, for the three-year period
Expected volatility	68.07%
Risk-free rate	0.36%
Expected term (in years)	2.90
Expected dividends	0
Shares granted	208,046
Average fair value of shares granted	22.59
Performance Shares [Member] \| Maximum [Member]
Share Based Compensation (Textual) [Abstract]
Range for number of performance shares earned Maximum	200.00%
Performance Shares [Member] \| Minimum [Member]
Share Based Compensation (Textual) [Abstract]
Range for number of performance shares earned Minimum	0.00%

Number of installments to make stock options exercisable.

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- Definition

Share based compensation arrangement by share based payment award award expiration period.

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions expected volatility calculation.

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions historical expected volatility.

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions implied expected volatility.

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- Definition

Share-based compensation arrangement by share-based payment award terms of award maximum.

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- Definition

Share-based compensation arrangement by share-based payment award terms of award minimum.

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- Definition

Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

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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).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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).

+ 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(2)(c)

-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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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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

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- Definition

The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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- Definition

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph e(2)(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.

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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-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

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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

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

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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