CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (DEFICIT) - USD ($) shares in Thousands, $ in Thousands	Total	BAV	Stock Compensation Plan	Pre-spin equity grants expense Stock Compensation Plan	Series D Convertible Preferred Stock	Common Stock	Common Stock BAV	Treasury Stock	Additional Paid-in Capital	Additional Paid-in Capital BAV	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests in Consolidated Entities	Convertible Preferred Stock	Redeemable Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2018						2,392								8,120
Beginning balance at Dec. 31, 2018	$ 65,901					$ 24			$ 280,159		$ (214,242)	$ (498)	$ 458	$ 200,847	$ 3,531
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation (in shares)						0
Equity-based compensation	2,158								2,155		0		3
Allocated stock-based compensation expense	8,026		$ 2,158
Acquisitions (in shares)							60
Acquisitions		$ 3,755					$ 1			$ 3,754
Investment in Real Estate Advisory Holdings LLC (in shares)						17
Investment in Real Estate Advisory Holdings LLC	1,000								1,000
Amortization of preferred stock discount	(491)										(491)			$ 491
Dividends declared - preferred stock	(2,791)										(2,791)
Dividends undeclared - preferred stock	$ 0
Deferred compensation plan distribution (in shares)	1					1
Deferred compensation plan distribution	$ 46
Employee advances	249								249
Contributions from noncontrolling interests	455												455
Reallocation of carrying value	(356)								(234)				(122)		356
Redemption value adjustment	111										111				(111)
Distributions to consolidated noncontrolling interests	(4)										0		(4)
Foreign currency translation adjustment	15											15			13
Reclassification for realized loss (gain) on available for sale securities	0
Net income (loss)	710										710
Net income (loss)	547												(163)		21
Ending balance (in shares) at Mar. 31, 2019						2,470								8,120
Ending balance at Mar. 31, 2019	70,595					$ 25			287,129		(216,703)	(483)	627	$ 201,338	3,810
Beginning balance (in shares) at Dec. 31, 2018						2,392								8,120
Beginning balance at Dec. 31, 2018	65,901					$ 24			280,159		(214,242)	(498)	458	$ 200,847	3,531
Ending balance (in shares) at Dec. 31, 2019						2,203		(2)						19,120
Ending balance at Dec. 31, 2019	42,024
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock	2
Accumulated deficit	(244,084)
Noncontrolling interests in consolidated entities	628
Convertible preferred stock					$ 474,060
Accumulated other comprehensive income (loss)	(216)
Redeemable noncontrolling interests	4,131
Treasury stock								$ (131)
Additional paid-in capital	285,825
Equity-based compensation (in shares)						257
Equity-based compensation	2,190								2,187				3
Forfeiture of restricted common shares	0							$ (13)	13
Forfeiture of restricted common shares (in shares)								(1)
Purchase of treasury stock	(5)							$ (5)	0
Allocated stock-based compensation expense	8,940		$ 2,049	$ 0
Shares acquired (in shares)								(1)
Amortization of preferred stock discount	(810)										(810)			$ 810
Dividends declared - preferred stock	(3,938)
Dividends undeclared - preferred stock	(3,937)
Deferred compensation plan distribution (in shares)						0
Deferred compensation plan distribution	2
Employee advances	124								124
Contributions from noncontrolling interests	77												77
Reallocation of carrying value	(56)								(37)				(19)		56
Redemption value adjustment	(322)										(322)				322
Foreign currency translation adjustment	388											388			51
Unrealized gain (loss) on available for sale securities	(856)											(856)
Reclassification for realized loss (gain) on available for sale securities	375											375
Net income (loss)	(177,640)										(177,640)
Net income (loss)	(177,800)												(160)		(440)
Ending balance (in shares) at Mar. 31, 2020						2,460		(4)						19,120
Ending balance at Mar. 31, 2020	(142,544)					$ 2		$ (149)	$ 288,114		$ (430,731)	$ (309)	$ 529	$ 474,870	$ 4,120
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock	2
Accumulated deficit	(430,731)
Noncontrolling interests in consolidated entities	529
Convertible preferred stock					$ 474,870
Accumulated other comprehensive income (loss)	(309)
Redeemable noncontrolling interests	4,120
Treasury stock	(149)
Additional paid-in capital	$ 288,114