Share-Based Compensation - Summary of Weighted-Average Assumptions Performance Shares (Details) (USD $)	12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate	0.82%
Simulation period (years)	2 years 9 months 5 days
Volatility	46.58%
Beginning TSR price	$ 28.09
Forfeiture rate	2.20%

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Share-Based Compensation Arrangement By Share-Based Payment Award, Performance Shares, Fair Value Assumptions, Annual Forfeiture Rate

No definition available.

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Share-Based Compensation Arrangement By Share-Based Payment Award, Performance Shares, Fair Value Assumptions, Beginning TSR Price

No definition available.

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The estimated measure of the percentage by which a performance share price is expected to fluctuate during a period.

No definition available.

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

No definition available.

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Simulation Period of performance share compensation awards, in 'PnYnMnDTnHnMnS' format.

No definition available.

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