Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail)

v2.4.1.9
Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Intangible assets $ 24,170us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets $ 25,050us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Other 37us-gaap_DeferredTaxAssetsOther 851us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 24,207us-gaap_DeferredTaxAssetsGross 25,901us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities    
Intangible assets 202us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 218us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Investment on underlying SLP partnership 1,170samg_DeferredIncomeTaxLiabilitiesInvestmentOnUnderlyingSLPPartnership  
Total deferred tax liabilities 1,372us-gaap_DeferredIncomeTaxLiabilities 218us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets (liabilities) $ 22,835us-gaap_DeferredTaxAssetsLiabilitiesNet $ 25,683us-gaap_DeferredTaxAssetsLiabilitiesNet