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Summary of Significant Accounting Policies (Details 5) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Stock-based compensation costs
Time period of historical volatility of stock used to estimate expected volatility	5 years 5 months 12 days
Expected dividend yield assumption (as a percent)	0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Granted (in shares)	1,662,035us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Accrued salaries and wages	$ 69,671,000us-gaap_EmployeeRelatedLiabilitiesCurrent		$ 84,034,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Stock based compensation expense	2,100,000us-gaap_AllocatedShareBasedCompensationExpense	2,600,000us-gaap_AllocatedShareBasedCompensationExpense
Weighted-average assumptions used in the Black-Scholes option-pricing model
Risk-free interest rate (as a percent)	1.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate		1.68%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Expected volatility (as a percent)	36.93%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate		44.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Weighted-average expected life	5 years 5 months 12 days		5 years 5 months 12 days
Phantom Share Units (PSUs)
Stock-based compensation costs
Accrued salaries and wages	7,000,000us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember		8,200,000us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Total compensation cost related to nonvested awards not yet recognized	26,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Period for recognition of unrecognized compensation cost	2 years 3 months 18 days
Stock based compensation expense	4,500,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember	1,400,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Amounts paid on cash settled awards	5,200,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember	5,500,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Phantom Share Units (PSUs) | Minimum
Stock-based compensation costs
Vesting period	3 years
Phantom Share Units (PSUs) | Maximum
Stock-based compensation costs
Vesting period	5 years
Stock Appreciation Rights (SARs)
Stock-based compensation costs
Vesting period	4 years
Accrued salaries and wages	9,100,000us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember		6,300,000us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Total compensation cost related to nonvested awards not yet recognized	8,700,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Period for recognition of unrecognized compensation cost	2 years 11 months 1 day
Stock based compensation expense	4,600,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	300,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Amounts paid on cash settled awards	$ 1,800,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	$ 500,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember

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- Definition

Represents the time period of historical volatility of stock used to estimate expected volatility, in periods.

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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.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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

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

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