Annual report pursuant to Section 13 and 15(d)

Intangible Assets and Goodwill - Additional Information (Detail)

v2.4.1.9
Intangible Assets and Goodwill - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended
Oct. 02, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]        
Goodwill impairment $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss
Franchise asset impairment charge   2,200,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived 600,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Definite lived intangible assets, amortization expense   $ 1,200,000us-gaap_AmortizationOfIntangibleAssets $ 1,600,000us-gaap_AmortizationOfIntangibleAssets $ 1,600,000us-gaap_AmortizationOfIntangibleAssets
Lease Agreements [Member]        
Finite-Lived Intangible Assets [Line Items]        
Weighted-average amortization period   17 years