Summary of Significant Accounting Policies - Narrative (Details)	9 Months Ended
Sep. 30, 2017
Customer Contracts
Indefinite-lived Intangible Assets [Line Items]
Customer life	9 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.

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