Annual report pursuant to Section 13 and 15(d)

Intangible Assets and Goodwill - Definite Life Intangible Assets (Detail)

v2.4.1.9
Intangible Assets and Goodwill - Definite Life Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Less accumulated amortization $ (10,698)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ (11,587)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Definite life intangibles, net 6,620us-gaap_FiniteLivedIntangibleAssetsNet 8,331us-gaap_FiniteLivedIntangibleAssetsNet
Favorable Lease Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Definite life intangibles, gross $ 17,318us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sah_FavorableLeaseAgreementsMember
$ 19,918us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= sah_FavorableLeaseAgreementsMember