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Subsequent Events (Narrative) (Details) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2017 USD ($) financial_institution | Jul. 24, 2017 USD ($) $ / shares | Jun. 30, 2017 $ / shares | Jun. 30, 2016 $ / shares | Jun. 30, 2017 $ / shares | Jun. 30, 2016 $ / shares
Subsequent Event [Line Items] |  |  |  |  |  |
Cash dividends declared per Class A and Class B share (in dollars per share) | $ / shares |  |  | $ 0.27 | $ 0.25 | $ 0.52 | $ 0.45
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Cash dividends declared per Class A and Class B share (in dollars per share) | $ / shares |  | $ 0.27 |  |  |  |
Dividends payable |  | $ 6,800,000 |  |  |  |
Subsequent Event | Senior Notes | Senior Notes Due 2025 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Aggregate principal amount in private offering |  | $ 300,000,000 |  |  |  |
Stated interest rate |  | 5.25% |  |  |  |
Redemption percentage price |  | 100.00% |  |  |  |
Percentage of principal amount redeemable |  | 101.00% |  |  |  |
Underwriting and other fees of issuance |  | $ 5,000,000 |  |  |  |
Subsequent Event | Line of Credit | Amended Revolving Credit Facility |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Total financing commitment | $ 2,400,000,000.0 |  |  |  |  |
Number of financial institutions | financial_institution | 18 |  |  |  |  |
Number of manufactured-affiliated finance companies | financial_institution | 7 |  |  |  |  |
Higher borrowing capacity option | $ 2,750,000,000.00 |  |  |  |  |
Subsequent Event | Revolving Credit Facility | Line of Credit | Amended Revolving Credit Facility |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Total financing commitment | 250,000,000 |  |  |  |  |
Subsequent Event | New Vehicle Inventory Floor Plan Pricing | Line of Credit | Amended Revolving Credit Facility |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Total financing commitment | 1,900,000,000.0 |  |  |  |  |
Subsequent Event | Used Vehicle Inventory Floor Plan Financing | Line of Credit | Amended Revolving Credit Facility |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Total financing commitment | $ 250,000,000 |  |  |  |  |

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