Earnings Per Share - Additional Information (Details) shares in Millions	6 Months Ended
Jun. 30, 2018 $ / shares shares
Earnings Per Share [Abstract]
Warrants, Outstanding \| shares	3.5
Warrants, exercise price \| $ / shares	$ 42.04
Warrants, Term	4 years

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant