Restructuring and Long-lived Asset Impairment (Details) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($) location	Sep. 30, 2019 USD ($) location	Sep. 30, 2019 USD ($) location	Sep. 30, 2019 USD ($) location	Sep. 03, 2019 USD ($) location item
2019 Strategic Shift
Number of Outdoor Lifestyle Locations | location					37
Number of outdoor lifestyle locations previously closed or not opened | location					5
Number of locations closed | location	3	7		23
Long-lived Asset Impairment
Number of locations with impaired long-lived assets | location	38	38	38	38
Number of locations with impaired long-lived assets not related to the 2019 Strategic Shift | location	2	2	2	2
Long-lived asset impairment		$ 50,025	$ 50,025
Leasehold improvements
Long-lived Asset Impairment
Long-lived asset impairment		16,900
Furniture and equipment
Long-lived Asset Impairment
Long-lived asset impairment		23,700
Operating lease right-of-use assets
Long-lived Asset Impairment
Long-lived asset impairment		9,400
Selling, general, and administrative
Restructuring Costs
Charged to expense		66	66
Costs applicable to revenue
Restructuring Costs
Charged to expense		$ 170	$ 170
TheHouse.com
2019 Strategic Shift
Number of Outdoor Lifestyle Locations | location	3	3	3	3	7
Number of locations that will add RV sales and/or services | location					6
2019 Strategic Shift
2019 Strategic Shift
Number of locations that will be restructured | location					28
Number of distribution centers to be closed | item					1
Restructuring Costs
Charged to expense		$ 27,724	$ 27,724
Long-lived Asset Impairment
Number of Outdoor Lifestyle locations with impaired long-lived assets | location	26	26	26	26
Long-lived asset impairment		$ 48,300
2019 Strategic Shift | One-time termination benefits
2019 Strategic Shift
Expected incurred costs					$ 1,000
Restructuring Costs
Charged to expense		182
Ending balance	$ 182	182	$ 182	$ 182
2019 Strategic Shift | Contract termination | Minimum
2019 Strategic Shift
Expected incurred costs					10,000
2019 Strategic Shift | Contract termination | Maximum
2019 Strategic Shift
Expected incurred costs					15,000
2019 Strategic Shift | Incremental inventory reserve charges
2019 Strategic Shift
Expected incurred costs					27,300
2019 Strategic Shift | Other associated costs
Restructuring Costs
Charged to expense		236	236
Ending balance	236	236	236	236
2019 Strategic Shift | Other associated costs | Minimum
2019 Strategic Shift
Expected incurred costs					4,000
2019 Strategic Shift | Other associated costs | Maximum
2019 Strategic Shift
Expected incurred costs					$ 6,000
2019 Strategic Shift | Restructuring costs excluding incremental inventory reserve charges
Restructuring Costs
Charged to expense		418
Ending balance	$ 418	418	418	$ 418
2019 Strategic Shift | Selling, general, and administrative | One-time termination benefits
Restructuring Costs
Charged to expense		182	182
2019 Strategic Shift | Costs applicable to revenue | Incremental inventory reserve charges
Restructuring Costs
Charged to expense		$ 27,306	$ 27,306
2019 Strategic Shift | TheHouse.com
2019 Strategic Shift
Number of locations that will be restructured | location					2