Silvercrest Asset Management Group LLC Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cost, beginning balance	$ 25,027	$ 25,027
Cost, ending balance	25,027	25,027	$ 25,027
Accumulated amortization, beginning balance	(11,623)	(9,696)
Amortization expense	(1,826)	(1,927)	(1,640)
Accumulated amortization, ending balance	(13,449)	(11,623)	(9,696)
Net book value	$ 11,578	13,404
Minimum
Useful lives	3 years
Maximum
Useful lives	20 years
Customer Relationships
Cost, beginning balance	$ 22,560	22,560
Cost, ending balance	22,560	22,560	22,560
Accumulated amortization, beginning balance	(9,721)	(8,062)
Amortization expense	(1,646)	(1,659)
Accumulated amortization, ending balance	(11,367)	(9,721)	(8,062)
Net book value	$ 11,193	$ 12,839
Customer Relationships \| Minimum
Useful lives	10 years	10 years
Customer Relationships \| Maximum
Useful lives	20 years	20 years
Other Intangible Assets
Cost, beginning balance	$ 2,467	$ 2,467
Cost, ending balance	2,467	2,467	2,467
Accumulated amortization, beginning balance	(1,902)	(1,634)
Amortization expense	(180)	(268)
Accumulated amortization, ending balance	(2,082)	(1,902)	$ (1,634)
Net book value	$ 385	$ 565
Other Intangible Assets \| Minimum
Useful lives	3 years	3 years
Other Intangible Assets \| Maximum
Useful lives	5 years	5 years