Restricted Cash - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Cash And Cash Equivalents [Abstract]
Unrestricted cash designated for capital expenditures	$ 11.6	$ 9.2

Unrestricted cash designated for capital expenditures.

No definition available.

Name:	ck0001652926_UnrestrictedCashDesignatedForCapitalExpenditures
Namespace Prefix:	ck0001652926_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant