Employee Benefit Plans (Details) - USD ($) $ in Millions	7 Months Ended	12 Months Ended
Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Employer discretionary contribution amount	$ 2.4	$ 8.0	$ 4.3

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration