Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Fair Value Measurements
Transfers of assets between the fair value measurement levels 1 to level 2	$ 0	$ 0
Transfers of assets between the fair value measurement levels 2 to level 1	0	0
Transfers of liabilities between the fair value measurement levels 1 to level 2	0	0
Transfers of liabilities between the fair value measurement levels 2 to level 1	0	0
Transfers of assets or liabilities between the fair value measurement levels 3	0	0
Level 2 \| Carrying Value \| Term Loan Facility
Fair Value Measurements
Debt instrument	1,150,170	1,156,345
Level 2 \| Carrying Value \| Floor Plan Facility
Fair Value Measurements
Debt instrument	46,340	38,739
Level 2 \| Carrying Value \| Real Estate Facility
Fair Value Measurements
Debt instrument	20,044	9,520
Level 2 \| Fair Value \| Term Loan Facility
Fair Value Measurements
Debt instrument	994,100	1,116,338
Level 2 \| Fair Value \| Floor Plan Facility
Fair Value Measurements
Debt instrument	43,026	40,139
Level 2 \| Fair Value \| Real Estate Facility
Fair Value Measurements
Debt instrument	$ 21,822	$ 10,850

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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- References

No definition available.

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

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- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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- Definition

Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

+ References

No definition available.

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