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Derivative Instruments and Risk Management Activities - Narrative (Details) | 12 Months Ended |
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Dec. 31, 2018 USD ($) derivative_instrument | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 02, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Notional value of swaps that became effective in the period | $ 300,000,000 |  |  |
Maximum notional amount of derivatives in effect at any time | 902,400,000 |  |  |
Accumulated unrealized gains (losses), net of income taxes | 8,900,000 | $ (700,000) | $ (9,300,000) |
Gain (loss) related to ineffectiveness | 0 | 0 | 0 |
Total floorplan interest expense | 59,882,000 | 52,372,000 | 44,927,000 |
Amount expected to be reclassified out of other comprehensive income (loss) into earnings as additional floorplan interest expense or other interest expense in the next twelve months | 4,200,000 |  |  |
Level 2 |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value of liabilities from interest rate risk management activities | 1,811,000 | 10,579,000 |  |
Fair value of assets from interest rate risk management activities | 13,576,000 | 9,501,000 |  |
Floorplan Interest Expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Impact of interest rate hedges on floorplan interest expense | (4,671,000) | (10,272,000) | $ (11,097,000) |
Interest Rate Derivative Instruments |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Aggregate notional value | $ 753,100,000 | $ 623,000,000 |  |
Weighted average derivative interest rate | 2.40% | 2.50% |  |
Interest Rate Swaps with Forward Start Dates |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Aggregate notional value | $ 275,000,000 |  |  | $ 150,000,000
Weighted average derivative interest rate | 1.90% |  |  |
Number of additional forward interest rate swaps | derivative_instrument | 5 |  |  |

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- Definition Interest expense incurred on borrowings under the floorplan line of the credit facility and arrangements with vehicle manufacturer affiliates for the financing of specific new, used and rental vehicle inventory. Interest expense also includes the net impact of interest rate swap settlements during the period, which are designed to hedge exposure to variable interest rates. + References No definition available. + Details
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- Definition Maximum notional amount of derivatives in effect at any time. + References No definition available. + Details
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- Definition Notional amount of newly entered swaps + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL34724391-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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