Goodwill (Changes To The Carrying Amount) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning balance	$ 124,210	$ 124,031
Correction related to acquisition purchase price allocation		179
Benefit applied to reduce goodwill	541
Business acquisitions	2,410
Ending balance	126,079	124,210
Ladenburg
Goodwill [Roll Forward]
Beginning balance	301	301
Correction related to acquisition purchase price allocation		0
Benefit applied to reduce goodwill	0
Business acquisitions	0
Ending balance	301	301
Independent Advisory and Brokerage Services
Goodwill [Roll Forward]
Beginning balance	111,210	111,031
Correction related to acquisition purchase price allocation		179
Benefit applied to reduce goodwill	541
Business acquisitions	246
Ending balance	110,915	111,210
Insurance Brokerage
Goodwill [Roll Forward]
Beginning balance	12,699	12,699
Correction related to acquisition purchase price allocation		0
Benefit applied to reduce goodwill	0
Business acquisitions	2,164
Ending balance	$ 14,863	$ 12,699