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Basis of Presentation - Additional Information (Details) - 12 months ended Dec. 31, 2017 | Segment | Reporting_Unit
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Number of reportable segments | 4 | 5

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration