Annual report pursuant to Section 13 and 15(d)

Intangible Assets and Goodwill - Additional Information (Detail)

v3.8.0.1
Intangible Assets and Goodwill - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Goodwill impairment $ 900,000 $ 0  
Definite life Intangible asset, impairment charge 0 0 $ 0
Definite lived intangible assets, amortization expense $ 600,000 600,000 600,000
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 $ 3,600,000    
Discontinued Operations [Member] | Franchise Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Goodwill impairment 900,000    
Continuing Operations [Member] | Franchise Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Indefinite life Intangible asset, impairment charge $ 3,600,000 $ 0 $ 3,300,000