Debt (Details)				3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 15, 2020 USD ($)	May 15, 2020 USD ($)	Nov. 01, 2019 USD ($)	Sep. 30, 2020 USD ($) installments	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) installments	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 03, 2020 USD ($)	Aug. 10, 2018 USD ($)	Dec. 01, 2017 USD ($)	Jan. 31, 2012 USD ($)
Debt Instrument [Line Items]
Effective interest rate				9.50%		9.50%
Seller Trust L Bonds				$ 366,892,000		$ 366,892,000		$ 366,892,000		$ 366,900,000
Repayment of principal		$ 25,000,000.0				$ 25,000,000.0
Extension fee percentage		0.025
Repayment of principal, interest, and extension fee	$ 28,600,000
Loan installments | installments				3		3
Outstanding balance						110.00%
Outstanding balance, fee				2.00%		2.00%
Permitted maximum capital contributions in exchange				$ 152,000,000.0		$ 152,000,000.0
Time after assumption of loans						2 years
Percentage of outstanding units				5.00%		5.00%
Tax liability from grant				$ 30,000,000		$ 30,000,000
Additional debt or borrowings threshold				$ 10,000,000.0		$ 10,000,000.0
L Bonds
Debt Instrument [Line Items]
Debt offering, maximum principal amount									$ 2,000,000,000.0			$ 1,000,000,000.0
Debt offering, additional principal amount											$ 1,000,000,000.0
Debt, weighted average interest rate				7.22%		7.22%		7.15%		7.50%
Long-term debt, gross				$ 1,200,000,000		$ 1,200,000,000		$ 900,000,000
Amortization				4,300,000	$ 3,200,000	12,400,000	$ 9,200,000
Debt issuance costs, gross				$ 45,800,000		$ 45,800,000
Amortization period of deferred financing cost						7 years
LNV Corporation
Debt Instrument [Line Items]
Senior credit facility			$ 300,000,000.0
LIBOR floor						1.50%
Basis spread on variable rate						8.00%
Effective interest rate				9.00%		9.00%
Additional collateral pledged			298,300,000
Advance received			$ 37,100,000
Portfolio pledged, percentage						76.90%
Line of credit facility, maximum month-end outstanding amount						$ 213,100,000		184,600,000
Unamortized deferred financing costs				$ 9,200,000		$ 9,200,000		$ 10,200,000
LNV Corporation | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate						7.50%