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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) | 1,662,035 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |
Accrued salaries and wages | $ 69,671,000 us-gaap_EmployeeRelatedLiabilitiesCurrent |  | $ 84,034,000 us-gaap_EmployeeRelatedLiabilitiesCurrent
Stock based compensation expense | 2,100,000 us-gaap_AllocatedShareBasedCompensationExpense | 2,600,000 us-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 | 7,000,000 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember |  | 8,200,000 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember
Total compensation cost related to nonvested awards not yet recognized | 26,200,000 us-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 | 4,500,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 1,400,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember |
Amounts paid on cash settled awards | 5,200,000 us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 5,500,000 us-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 | 9,100,000 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  | 6,300,000 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Total compensation cost related to nonvested awards not yet recognized | 8,700,000 us-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 | 4,600,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 300,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |
Amounts paid on cash settled awards | $ 1,800,000 us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | $ 500,000 us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |

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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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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=27013229&loc=d3e301413-122809 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the 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 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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