Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details)	12 Months Ended
Dec. 31, 2018
Minimum
Finite-Lived Intangible Assets [Line Items]
Cost allocation period for definite-lived intangible assets	1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Cost allocation period for definite-lived intangible assets	15 years

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration