Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($)  $ in Thousands  | 
Total  | 
Class A Common Stock  | 
Class B Common Stock  | 
Additional Paid-In Capital  | 
Retained Earnings  | 
Total Silvercrest Asset Management Group Inc.'s Equity  | 
Non-controlling Interest  | 
| Balance at Dec. 31, 2018 | 
$ 82,399
 | 
$ 85
 | 
$ 48
 | 
$ 43,584
 | 
$ 12,330
 | 
$ 56,047
 | 
$ 26,352
 | 
| Balance, Shares at Dec. 31, 2018 | 
 
 | 
8,518,000
 | 
4,934,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Distributions to partners | 
(2,285)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(2,285)
 | 
| Repayment of notes receivable from partners | 
291
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
291
 | 
| Equity-based compensation | 
842
 | 
 
 | 
 
 | 
6
 | 
 
 | 
6
 | 
836
 | 
| Issuance of Class B shares, Value | 
20
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
20
 | 
| Issuance of Class B shares, Shares | 
 
 | 
 
 | 
2,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Net Income | 
3,045
 | 
 
 | 
 
 | 
 
 | 
1,709
 | 
1,709
 | 
1,336
 | 
| Deferred tax, net of amounts payable under tax receivable agreement | 
9
 | 
 
 | 
 
 | 
9
 | 
 
 | 
9
 | 
 
 | 
| Accrued interest on notes receivable from partners | 
(3)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(3)
 | 
| Share conversion, Value | 
 
 | 
 
 | 
 
 | 
97
 | 
 
 | 
97
 | 
(97)
 | 
| Share conversion, Shares | 
 
 | 
17,000
 | 
(17,000)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Dividends paid on Class A common stock | 
(1,278)
 | 
 
 | 
 
 | 
 
 | 
(1,278)
 | 
(1,278)
 | 
 
 | 
| Balance at Mar. 31, 2019 | 
83,040
 | 
$ 85
 | 
$ 48
 | 
43,696
 | 
12,761
 | 
56,590
 | 
26,450
 | 
| Balance, Shares at Mar. 31, 2019 | 
 
 | 
8,535,000
 | 
4,919,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Balance at Dec. 31, 2018 | 
82,399
 | 
$ 85
 | 
$ 48
 | 
43,584
 | 
12,330
 | 
56,047
 | 
26,352
 | 
| Balance, Shares at Dec. 31, 2018 | 
 
 | 
8,518,000
 | 
4,934,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Net Income | 
11,219
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Balance at Sep. 30, 2019 | 
95,235
 | 
$ 92
 | 
$ 51
 | 
48,238
 | 
14,608
 | 
62,989
 | 
32,246
 | 
| Balance, Shares at Sep. 30, 2019 | 
 
 | 
9,180,000
 | 
5,181,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Balance at Dec. 31, 2018 | 
82,399
 | 
$ 85
 | 
$ 48
 | 
43,584
 | 
12,330
 | 
56,047
 | 
26,352
 | 
| Balance, Shares at Dec. 31, 2018 | 
 
 | 
8,518,000
 | 
4,934,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Balance at Dec. 31, 2019 | 
97,807
 | 
$ 93
 | 
$ 49
 | 
49,246
 | 
15,648
 | 
65,036
 | 
32,771
 | 
| Balance, Shares at Dec. 31, 2019 | 
 
 | 
9,329,879
 | 
5,031,017
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Balance at Mar. 31, 2019 | 
83,040
 | 
$ 85
 | 
$ 48
 | 
43,696
 | 
12,761
 | 
56,590
 | 
26,450
 | 
| Balance, Shares at Mar. 31, 2019 | 
 
 | 
8,535,000
 | 
4,919,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Distributions to partners | 
(3,474)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(3,474)
 | 
| Equity-based compensation | 
879
 | 
 
 | 
 
 | 
6
 | 
 
 | 
6
 | 
873
 | 
| Equity-based compensation, Shares | 
 
 | 
2,000
 | 
1,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Net Income | 
3,351
 | 
 
 | 
 
 | 
 
 | 
1,864
 | 
1,864
 | 
1,487
 | 
| Deferred tax, net of amounts payable under tax receivable agreement | 
28
 | 
 
 | 
 
 | 
28
 | 
 
 | 
28
 | 
 
 | 
| Accrued interest on notes receivable from partners | 
(3)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(3)
 | 
| Share conversion, Value | 
 
 | 
$ 1
 | 
$ (1)
 | 
458
 | 
 
 | 
458
 | 
(458)
 | 
| Share conversion, Shares | 
 
 | 
87,000
 | 
(87,000)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Dividends paid on Class A common stock | 
(1,293)
 | 
 
 | 
 
 | 
 
 | 
(1,293)
 | 
(1,293)
 | 
 
 | 
| Balance at Jun. 30, 2019 | 
82,528
 | 
$ 86
 | 
$ 47
 | 
44,188
 | 
13,332
 | 
57,653
 | 
24,875
 | 
| Balance, Shares at Jun. 30, 2019 | 
 
 | 
8,624,000
 | 
4,833,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Distributions to partners | 
(1,626)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(1,626)
 | 
| Equity-based compensation | 
445
 | 
 
 | 
$ 3
 | 
6
 | 
 
 | 
9
 | 
436
 | 
| Equity-based compensation, Shares | 
 
 | 
 
 | 
241,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Issuance of Class B shares, Value | 
8,952
 | 
 
 | 
$ 7
 | 
 
 | 
 
 | 
7
 | 
8,945
 | 
| Issuance of Class B shares, Shares | 
 
 | 
 
 | 
663,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Net Income | 
4,823
 | 
 
 | 
 
 | 
 
 | 
2,653
 | 
2,653
 | 
2,170
 | 
| Deferred tax, net of amounts payable under tax receivable agreement | 
1,493
 | 
 
 | 
 
 | 
1,493
 | 
 
 | 
1,493
 | 
 
 | 
| Accrued interest on notes receivable from partners | 
(3)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(3)
 | 
| Share conversion, Value | 
 
 | 
$ 6
 | 
$ (6)
 | 
2,551
 | 
 
 | 
2,551
 | 
(2,551)
 | 
| Share conversion, Shares | 
 
 | 
556,000
 | 
(556,000)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Dividends paid on Class A common stock | 
(1,377)
 | 
 
 | 
 
 | 
 
 | 
(1,377)
 | 
(1,377)
 | 
 
 | 
| Balance at Sep. 30, 2019 | 
95,235
 | 
$ 92
 | 
$ 51
 | 
48,238
 | 
14,608
 | 
62,989
 | 
32,246
 | 
| Balance, Shares at Sep. 30, 2019 | 
 
 | 
9,180,000
 | 
5,181,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Balance at Dec. 31, 2019 | 
97,807
 | 
$ 93
 | 
$ 49
 | 
49,246
 | 
15,648
 | 
65,036
 | 
32,771
 | 
| Balance, Shares at Dec. 31, 2019 | 
 
 | 
9,329,879
 | 
5,031,017
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Distributions to partners | 
(2,226)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(2,226)
 | 
| Repayment of notes receivable from partners | 
300
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
300
 | 
| Equity-based compensation | 
109
 | 
 
 | 
 
 | 
9
 | 
 
 | 
9
 | 
100
 | 
| Net Income | 
9,690
 | 
 
 | 
 
 | 
 
 | 
5,532
 | 
5,532
 | 
4,158
 | 
| Deferred tax, net of amounts payable under tax receivable agreement | 
(364)
 | 
 
 | 
 
 | 
(364)
 | 
 
 | 
(364)
 | 
 
 | 
| Accrued interest on notes receivable from partners | 
(2)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(2)
 | 
| Share conversion, Value | 
 
 | 
$ 2
 | 
$ (2)
 | 
1,149
 | 
 
 | 
1,149
 | 
(1,149)
 | 
| Share conversion, Shares | 
 
 | 
176,000
 | 
(176,000)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Dividends paid on Class A common stock | 
(1,520)
 | 
 
 | 
 
 | 
 
 | 
(1,520)
 | 
(1,520)
 | 
 
 | 
| Balance at Mar. 31, 2020 | 
103,794
 | 
$ 95
 | 
$ 47
 | 
50,040
 | 
19,660
 | 
69,842
 | 
33,952
 | 
| Balance, Shares at Mar. 31, 2020 | 
 
 | 
9,506,000
 | 
4,855,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Balance at Dec. 31, 2019 | 
97,807
 | 
$ 93
 | 
$ 49
 | 
49,246
 | 
15,648
 | 
65,036
 | 
32,771
 | 
| Balance, Shares at Dec. 31, 2019 | 
 
 | 
9,329,879
 | 
5,031,017
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Net Income | 
13,952
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Balance at Sep. 30, 2020 | 
100,913
 | 
$ 95
 | 
$ 47
 | 
50,185
 | 
19,155
 | 
69,482
 | 
31,431
 | 
| Balance, Shares at Sep. 30, 2020 | 
 
 | 
9,544,607
 | 
4,827,731
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Balance at Mar. 31, 2020 | 
103,794
 | 
$ 95
 | 
$ 47
 | 
50,040
 | 
19,660
 | 
69,842
 | 
33,952
 | 
| Balance, Shares at Mar. 31, 2020 | 
 
 | 
9,506,000
 | 
4,855,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Distributions to partners | 
(2,798)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(2,798)
 | 
| Equity-based compensation | 
157
 | 
 
 | 
 
 | 
10
 | 
 
 | 
10
 | 
147
 | 
| Equity-based compensation, Shares | 
 
 | 
2,000
 | 
9,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Net Income | 
782
 | 
 
 | 
 
 | 
 
 | 
490
 | 
490
 | 
292
 | 
| Deferred tax, net of amounts payable under tax receivable agreement | 
8
 | 
 
 | 
 
 | 
8
 | 
 
 | 
8
 | 
 
 | 
| Accrued interest on notes receivable from partners | 
(2)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(2)
 | 
| Share conversion, Value | 
 
 | 
 
 | 
 
 | 
88
 | 
 
 | 
88
 | 
(88)
 | 
| Share conversion, Shares | 
 
 | 
12,000
 | 
(12,000)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Dividends paid on Class A common stock | 
(1,523)
 | 
 
 | 
 
 | 
 
 | 
(1,523)
 | 
(1,523)
 | 
 
 | 
| Balance at Jun. 30, 2020 | 
100,418
 | 
$ 95
 | 
$ 47
 | 
50,146
 | 
18,627
 | 
68,915
 | 
31,503
 | 
| Balance, Shares at Jun. 30, 2020 | 
 
 | 
9,520,000
 | 
4,852,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Distributions to partners | 
(1,497)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(1,497)
 | 
| Equity-based compensation | 
221
 | 
 
 | 
 
 | 
52
 | 
 
 | 
52
 | 
169
 | 
| Equity-based compensation, Shares | 
 
 | 
1,000
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Net Income | 
3,480
 | 
 
 | 
 
 | 
 
 | 
2,059
 | 
2,059
 | 
1,421
 | 
| Deferred tax, net of amounts payable under tax receivable agreement | 
(176)
 | 
 
 | 
 
 | 
(176)
 | 
 
 | 
(176)
 | 
 
 | 
| Accrued interest on notes receivable from partners | 
(2)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
 
 | 
(2)
 | 
| Share conversion, Value | 
 
 | 
 
 | 
 
 | 
163
 | 
 
 | 
163
 | 
(163)
 | 
| Share conversion, Shares | 
 
 | 
24,000
 | 
(24,000)
 | 
 
 | 
 
 | 
 
 | 
 
 | 
| Dividends paid on Class A common stock | 
(1,531)
 | 
 
 | 
 
 | 
 
 | 
(1,531)
 | 
(1,531)
 | 
 
 | 
| Balance at Sep. 30, 2020 | 
$ 100,913
 | 
$ 95
 | 
$ 47
 | 
$ 50,185
 | 
$ 19,155
 | 
$ 69,482
 | 
$ 31,431
 | 
| Balance, Shares at Sep. 30, 2020 | 
 
 | 
9,544,607
 | 
4,827,731
 | 
 
 | 
 
 | 
 
 | 
 
 |