Summary of Significant Accounting Policies - Basis of Consolidation Policy Additional Information (Details)	12 Months Ended
Dec. 31, 2018
Maximum [Member]
Basis of Consolidation [Abstract]
Ownership interest to use equity method	50.00%
Ownership interest to use cost method	20.00%
Minimum [Member]
Basis of Consolidation [Abstract]
Ownership interest to be held for consolidation	50.00%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant