Consolidated Statements of Changes in Members' Deficit/Shareholders' Equity - USD ($) $ in Thousands	Total Members’ Deficit/ Shareholders’ Equity	Common Stock Class A common stock	Common Stock Class B common stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Common Units	Non-controlling Interest	Total
Beginning balance at Dec. 31, 2016	$ (261,883)				$ (405,526)	$ (10,739)	$ 154,382		$ (261,883)
Increase (Decrease) in MEMBERS' DEFICIT
Net loss	(48,359)				(48,359)				(48,359)
Issuance of restricted common units in connection with acquisitions and contingent consideration	27,125						27,125		27,125
Accretion of senior preferred units return	(6,249)			$ (788)	(5,461)				(6,249)
Accretion of senior preferred units to estimated redemption value	(17,463)			(2,207)	(15,256)				(17,463)
Accretion of junior preferred units return	(672)			(85)	(587)				(672)
Accretion of junior preferred units to estimated redemption value	(8,452)			(1,068)	(7,384)				(8,452)
Issuance of convertible preferred units, redemption, retirement and recapitalization of units, net	(497,899)				(320,739)		(177,160)		(497,899)
Non-cash equity compensation expense	(34,879)			(34,879)					(34,879)
Currency translation adjustment - net of tax	2,470					2,470			2,470
Distributions for unitholders	(2,158)				(2,158)				(2,158)
Ending balance at Dec. 31, 2017	(778,661)			30,731	(805,470)	(8,269)	4,347		(778,661)
Increase (Decrease) in MEMBERS' DEFICIT
Net loss	(47,821)				(47,821)				(47,821)
Issuance of restricted common units in connection with acquisitions and contingent consideration	40,389						40,389		40,389
Non-cash equity compensation expense	24,987			24,987					24,987
Currency translation adjustment - net of tax	(1,398)					(1,398)			(1,398)
Retirement of treasury stock	(2,909)			(2,067)			(842)		(2,909)
Distributions for unitholders	(2,224)				(2,224)				(2,224)
Reorganization of equity structure	550,445	$ 239	$ 225	(271,307)	855,515	9,667	(43,894)	$ 258,670	809,115
Reorganization of equity structure (in shares)		23,881,002	22,499,665
Ending balance at Jul. 30, 2018	(217,192)	$ 239	$ 225	(217,656)				258,670	41,478
Ending Balance (in shares) at Jul. 30, 2018		23,881,002	22,499,665
Beginning balance at Dec. 31, 2017	(778,661)			30,731	(805,470)	(8,269)	$ 4,347		(778,661)
Increase (Decrease) in MEMBERS' DEFICIT
Net loss									(41,087)
Currency translation adjustment - net of tax									(4,509)
Ending balance at Dec. 31, 2018	469,662	$ 462	$ 228	471,386	(590)	(1,824)		342,858	812,520
Ending Balance (in shares) at Dec. 31, 2018		46,265,903	22,823,272
Beginning balance at Jul. 30, 2018	(217,192)	$ 239	$ 225	(217,656)				258,670	41,478
Beginning balance (in shares) at Jul. 30, 2018		23,881,002	22,499,665
Increase (Decrease) in MEMBERS' DEFICIT
Net loss	(590)				(590)			7,324	6,734
Change in non-controlling interest allocation	(56,222)			(56,222)				78,151	21,929
Non-cash equity compensation expense	5,412			5,412					5,412
Currency translation adjustment - net of tax	(1,824)					(1,824)		(1,287)	(3,111)
Issuance of common stock	(565,160)	$ (186)		(564,974)					(565,160)
Issuance of common stock (in shares)		18,648,649
Issuance of common stock in connection with acquisitions and contingent consideration	112,464	$ 37	$ 3	112,424					112,464
Issuance of common stock in connection with acquisitions and contingent consideration (in shares)		3,736,252	323,607
Adjustment of deferred tax assets, net of amounts payable under tax receivable agreements and changes from Focus LLC interest transactions	62,454			62,454					62,454
Ending balance at Dec. 31, 2018	469,662	$ 462	$ 228	471,386	(590)	(1,824)		342,858	812,520
Ending Balance (in shares) at Dec. 31, 2018		46,265,903	22,823,272
Increase (Decrease) in MEMBERS' DEFICIT
Net loss	(12,872)				(12,872)			847	(12,025)
Issuance (cancellation) of common stock in connection with exercise of Focus LLC common unit exchange rights	22,280	$ 8	$ (7)	22,279					22,280
Issuance (cancellation) of common stock in connection with exercise of Focus LLC common unit exchange rights (in shares)		747,523	(747,523)
Issuance of common stock in connection with exercise of Focus LLC incentive unit exchange rights	11,967	$ 4		11,963					11,967
Issuance of common stock in connection with exercise of Focus LLC incentive unit exchange rights (in shares)		394,814
Forfeiture of unvested Class A common stock	(412)			(412)					(412)
Forfeiture of unvested Class A common stock		(12,500)
Exercise of stock options	838			838					838
Exercise of stock options (in shares)		25,575
Change in non-controlling interest allocation	10,895			10,895				24,098	34,993
Non-cash equity compensation expense	3,490			3,490					3,490
Currency translation adjustment - net of tax	525					525		243	768
Adjustment of deferred tax assets, net of amounts payable under tax receivable agreements and changes from Focus LLC interest transactions	(463)			(463)					(463)
Ending balance at Dec. 31, 2019	$ 484,120	$ 474	$ 221	$ 498,186	$ (13,462)	$ (1,299)		$ 319,850	$ 803,970
Ending Balance (in shares) at Dec. 31, 2019		47,421,315	22,075,749