Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2017 | |
| Minimum | |
| Goodwill [Line Items] | |
| Intangible assets amortization period | 1 year |
| Maximum | |
| Goodwill [Line Items] | |
| Intangible assets amortization period | 15 years |
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- 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. No definition available.
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| 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. No definition available.
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| X | ||||||||||
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