Silvercrest Asset Management Group LLC Quarterly report pursuant to Section 13 or 15(d)

Investments and Fair Value Measurements - Category of Financial Instruments Not Held at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial Assets, Carrying Amount	$ 85,384us-gaap_Assets	$ 99,696us-gaap_Assets
Financial liabilities, Carrying Amount	30,810us-gaap_Liabilities	46,634us-gaap_Liabilities
Cash
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial Assets, Carrying Amount	18,572	30,820
Financial Assets, Fair Value	18,572	30,820
Level I \| Restricted Certificates of Deposit and Escrow
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial Assets, Carrying Amount	586	586
Financial Assets, Fair Value	586	586
Level II \| Notes Payable
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial liabilities, Carrying Amount	4,064	4,124
Financial liabilities, Fair Value	$ 4,064	$ 4,124