Annual report pursuant to Section 13 and 15(d)

Intangible Assets and Goodwill - Additional Information (Detail)

v3.6.0.2
Intangible Assets and Goodwill - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Goodwill impairment $ 0 $ 2,445,000  
Definite life Intangible asset, impairment charge 0 0 $ 0
Definite lived intangible assets, amortization expense $ 600,000 600,000 1,200,000
Lease Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period 17 years    
Lease Agreements [Member] | Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Expiration period 2020    
Lease Agreements [Member] | Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Expiration period 2027    
Franchise Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Indefinite life Intangible asset, impairment charge $ 0 3,300,000  
Discontinued Operations [Member] | Franchise Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Goodwill impairment   2,400,000  
Discontinued Operations [Member] | Franchise Assets [Member] | Dealership [Member]      
Finite-Lived Intangible Assets [Line Items]      
Indefinite life Intangible asset, impairment charge   2,400,000  
Continuing Operations [Member] | Franchise Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Indefinite life Intangible asset, impairment charge $ 0 $ 900,000 $ 2,200,000