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Basis of Presentation and Recently Issued Accounting Pronouncements - Goodwill and Indefinite-Lived Intangible Assets and Finite Lived Intangible and Long-Lived Assets (Details) | 12 Months Ended
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Dec. 31, 2017 reporting_unit
Finite-Lived Intangible Assets [Line Items] |
Number of reporting units | 1
Minimum |
Finite-Lived Intangible Assets [Line Items] |
Estimated economic lives | 3 years
Maximum |
Finite-Lived Intangible Assets [Line Items] |
Estimated economic lives | 10 years

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |