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Goodwill and Intangible Assets - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) Store | Dec. 31, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 471,493 | $ 471,493 | $ 472,437
Net of accumulated impairment losses | 797,600 | $ 797,600 | 796,700
Number of stand-alone pre-owned stores | Store |  | 2 |
Lease Agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Definite life intangibles | 5,000 | $ 5,000 | 5,300
Stand-alone Pre-owned Stores [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of goodwill | 900 | 900 |
Franchise Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Franchise assets | $ 74,900 | $ 74,900 | $ 74,900

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