Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers - Impact on Statement of Financial Condition (Details)

Revenue from Contracts with Customers - Impact on Statement of Financial Condition (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cash and cash equivalents	$ 145,417		$ 172,103	$ 75,643
Securities owned, at fair value	4,104		3,881
Receivables from clearing brokers	55,842		48,543
Receivables from other broker-dealers	2,263		2,822
Notes receivable from financial advisors, net	6,522		47,369
Other receivables, net	122,154		60,707
Fixed assets, net	23,886		23,621
Restricted cash	760		760
Intangible assets, net	76,131		103,611
Goodwill	124,210		124,210
Contract acquisition costs, net	73,234		0
Cash surrender value of life insurance	12,691		12,711
Other assets	36,941		31,687
Total assets	684,155		632,025	$ 524,048
Securities sold, but not yet purchased, at fair value	235		231
Accrued compensation	18,828		33,343
Commissions and fees payable	95,937		67,221
Accounts payable and accrued liabilities	52,205		40,478
Deferred rent	2,571		2,151
Deferred income taxes	6,532		2,968
Deferred compensation liability	18,340		18,161
Accrued interest	261		232
Notes Payable	98,997		96,849
Total liabilities	293,906		261,634
Commitments and contingencies (Note 9)
Preferred stock	2		2
Common stock	20		20
Additional paid-in capital	510,409		520,135
Accumulated deficit	(120,206)		(149,778)
Total shareholders’ equity of the Company	390,225		370,379
Noncontrolling interest	24		12
Total shareholders' equity	390,249		370,391
Total liabilities and shareholders' equity	684,155		632,025
Deferred Tax Assets, Net	36,941
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract acquisition costs, net		$ 40,566
Balances without the adoption of ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cash and cash equivalents	145,417
Securities owned, at fair value	4,104
Receivables from clearing brokers	55,842
Receivables from other broker-dealers	2,263
Notes receivable from financial advisors, net	57,038
Other receivables, net	60,231
Fixed assets, net	23,886
Restricted cash	760
Intangible assets, net	98,463
Goodwill	124,210
Contract acquisition costs, net	0
Cash surrender value of life insurance	12,691
Total assets	621,491
Securities sold, but not yet purchased, at fair value	235
Accrued compensation	18,816
Commissions and fees payable	63,366
Accounts payable and accrued liabilities	51,874
Deferred rent	2,571
Deferred income taxes	2,631
Deferred compensation liability	18,340
Accrued interest	261
Notes Payable	98,997
Total liabilities	257,091
Preferred stock	2
Common stock	20
Additional paid-in capital	510,409
Accumulated deficit	(146,044)
Total shareholders’ equity of the Company	364,387
Noncontrolling interest	13
Total shareholders' equity	364,400
Total liabilities and shareholders' equity	621,491
Deferred Tax Assets, Net	36,586
Effects of Change Higher/(Lower) \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cash and cash equivalents	0
Securities owned, at fair value	0
Receivables from clearing brokers	0
Receivables from other broker-dealers	0
Notes receivable from financial advisors, net	(50,516)
Other receivables, net	61,923
Fixed assets, net	0
Restricted cash	0
Intangible assets, net	(22,332)
Goodwill	0
Contract acquisition costs, net	73,234
Cash surrender value of life insurance	0
Total assets	62,664
Securities sold, but not yet purchased, at fair value	0
Accrued compensation	12
Commissions and fees payable	32,571
Accounts payable and accrued liabilities	331
Deferred rent	0
Deferred income taxes	3,901
Deferred compensation liability	0
Accrued interest	0
Notes Payable	0
Total liabilities	36,815
Preferred stock	0
Common stock	0
Additional paid-in capital	0
Accumulated deficit	25,838	24,109
Total shareholders’ equity of the Company	25,838
Noncontrolling interest	11
Total shareholders' equity	25,849
Total liabilities and shareholders' equity	62,664
Deferred Tax Assets, Net	$ 355
Adjusted
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cash and cash equivalents		172,103
Securities owned, at fair value		3,881
Receivables from clearing brokers		48,543
Receivables from other broker-dealers		2,822
Notes receivable from financial advisors, net		6,803
Other receivables, net		119,356
Fixed assets, net		23,621
Restricted cash		760
Intangible assets, net		79,966
Goodwill		124,210
Contract acquisition costs, net		61,340
Cash surrender value of life insurance		12,711
Other assets		31,712
Total assets		687,828
Securities sold, but not yet purchased, at fair value		231
Accrued compensation		33,233
Commissions and fees payable		96,616
Accounts payable and accrued liabilities		39,241
Deferred rent		2,151
Deferred income taxes		6,603
Deferred compensation liability		18,161
Accrued interest		232
Notes Payable		96,849
Total liabilities		293,317
Commitments and contingencies (Note 9)
Preferred stock		2
Common stock		20
Additional paid-in capital		520,135
Accumulated deficit		(125,669)
Total shareholders’ equity of the Company		394,488
Noncontrolling interest		23
Total shareholders' equity		394,511
Total liabilities and shareholders' equity		$ 687,828
Investment Banking \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cash and cash equivalents			0
Securities owned, at fair value			0
Receivables from clearing brokers			0
Receivables from other broker-dealers			0
Notes receivable from financial advisors, net			0
Other receivables, net			(137)
Fixed assets, net			0
Restricted cash			0
Intangible assets, net			0
Goodwill			0
Contract acquisition costs, net			0
Cash surrender value of life insurance			0
Other assets			25
Total assets			(112)
Securities sold, but not yet purchased, at fair value			0
Accrued compensation			(110)
Commissions and fees payable			0
Accounts payable and accrued liabilities			(104)
Deferred rent			0
Deferred income taxes			28
Deferred compensation liability			0
Accrued interest			0
Notes Payable			0
Total liabilities			(186)
Commitments and contingencies (Note 9)
Preferred stock			0
Common stock			0
Additional paid-in capital			0
Accumulated deficit			74
Total shareholders’ equity of the Company			74
Noncontrolling interest			0
Total shareholders' equity			74
Total liabilities and shareholders' equity			(112)
Insurance Renewals \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cash and cash equivalents			0
Securities owned, at fair value			0
Receivables from clearing brokers			0
Receivables from other broker-dealers			0
Notes receivable from financial advisors, net			0
Other receivables, net			58,786
Fixed assets, net			0
Restricted cash			0
Intangible assets, net			(23,645)
Goodwill			0
Contract acquisition costs, net			0
Cash surrender value of life insurance			0
Other assets			0
Total assets			35,141
Securities sold, but not yet purchased, at fair value			0
Accrued compensation			0
Commissions and fees payable			29,395
Accounts payable and accrued liabilities			0
Deferred rent			0
Deferred income taxes			1,489
Deferred compensation liability			0
Accrued interest			0
Notes Payable			0
Total liabilities			30,884
Commitments and contingencies (Note 9)
Preferred stock			0
Common stock			0
Additional paid-in capital			0
Accumulated deficit			4,257
Total shareholders’ equity of the Company			4,257
Noncontrolling interest			0
Total shareholders' equity			4,257
Total liabilities and shareholders' equity			35,141
Costs to obtain or fulfill a contract \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cash and cash equivalents			0
Securities owned, at fair value			0
Receivables from clearing brokers			0
Receivables from other broker-dealers			0
Notes receivable from financial advisors, net			(40,566)
Other receivables, net			0
Fixed assets, net			0
Restricted cash			0
Intangible assets, net			0
Goodwill			0
Contract acquisition costs, net			61,340
Cash surrender value of life insurance			0
Other assets			0
Total assets			20,774
Securities sold, but not yet purchased, at fair value			0
Accrued compensation			0
Commissions and fees payable			0
Accounts payable and accrued liabilities			(1,133)
Deferred rent			0
Deferred income taxes			2,118
Deferred compensation liability			0
Accrued interest			0
Notes Payable			0
Total liabilities			985
Commitments and contingencies (Note 9)
Preferred stock			0
Common stock			0
Additional paid-in capital			0
Accumulated deficit			19,778
Total shareholders’ equity of the Company			19,778
Noncontrolling interest			11
Total shareholders' equity			19,789
Total liabilities and shareholders' equity			$ 20,774