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Fair Value Measurement - Additional Information (Details) (Significant Unobservable Inputs (Level 3) [Member])
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3 Months Ended |
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Mar. 31, 2015
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| Fair Value Inputs, Liabilities, Quantitative Information [Line Items] | |
| Probability of achieving estimated projected earnings or the achievement of certain other objectives | 100.00% |
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Minimum [Member]
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| Fair Value Inputs, Liabilities, Quantitative Information [Line Items] | |
| Discount rates | 1.31% |
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Maximum [Member]
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| Fair Value Inputs, Liabilities, Quantitative Information [Line Items] | |
| Discount rates | 1.84% |