Unaudited condensed consolidated statements of changes in equity - USD ($) $ in Thousands	Total Shareholders' Equity	Common Stock Class A common stock	Common Stock Class B common stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Non-controlling Interest	Total
Beginning balance at Dec. 31, 2020	$ 539,799	$ 512	$ 207	$ 526,664	$ 14,583	$ (2,167)	$ 319,080	$ 858,879
Beginning balance (in shares) at Dec. 31, 2020		51,158,712	20,661,595
Increase (Decrease) in shareholders' equity
Net income	2,882				2,882		6,623	9,505
Issuance of units in connection with an acquisition and contingent consideration	1		$ 1					1
Issuance of units in connection with an acquisition and contingent consideration (in shares)			233,098
Issuance (cancellation) of common stock in connection with offering, net	317,860	$ 65	$ (63)	317,858				317,860
Issuance (cancellation) of common stock in connection with offering, net (in shares)		6,568,098	(6,306,301)
Issuance (cancellation) of common stock in connection with exercise of Focus LLC common unit exchange rights	109,677	$ 22	$ (22)	109,677				109,677
Issuance (cancellation) of common stock in connection with exercise of Focus LLC common unit exchange rights (in shares)		2,249,615	(2,249,615)
Issuance of common stock in connection with exercise of Focus LLC incentive unit exchange rights	8,350	$ 2		8,348				8,350
Issuance of common stock in connection with exercise of Focus LLC incentive unit exchange rights (in shares)		169,530
Exercise of stock options	5,345	$ 2		5,343				5,345
Exercise of stock options (in shares)		169,386
Change in non-controlling interest allocation	(328,318)			(328,318)			(100,028)	(428,346)
Non-cash equity compensation expenses	3,859			3,859				3,859
Currency translation adjustment - net of tax	(4,516)					(4,516)	(1,360)	(5,876)
Unrealized gain (loss) on interest rate swaps designated as cash flow hedges-net of tax	4,006					4,006	1,931	5,937
Adjustments of deferred taxes, net of amounts payable under tax receivable agreements and changes from Focus LLC interest transactions	16,110			16,110				16,110
Ending balance at Sep. 30, 2021	675,055	$ 603	$ 123	659,541	17,465	(2,677)	226,246	901,301
Ending Balance (in shares) at Sep. 30, 2021		60,315,341	12,338,777
Beginning balance at Jun. 30, 2021	668,696	$ 598	$ 127	650,421	16,816	734	230,389	899,085
Beginning balance (in shares) at Jun. 30, 2021		59,792,889	12,692,740
Increase (Decrease) in shareholders' equity
Net income	649				649		1,200	1,849
Issuance of units in connection with an acquisition and contingent consideration (in shares)			64,706
Issuance (cancellation) of common stock in connection with exercise of Focus LLC common unit exchange rights	21,901	$ 4	$ (4)	21,901				21,901
Issuance (cancellation) of common stock in connection with exercise of Focus LLC common unit exchange rights (in shares)		418,669	(418,669)
Issuance of common stock in connection with exercise of Focus LLC incentive unit exchange rights	1,825			1,825				1,825
Issuance of common stock in connection with exercise of Focus LLC incentive unit exchange rights (in shares)		34,898
Exercise of stock options	2,169	$ 1		2,168				2,169
Exercise of stock options (in shares)		68,885
Change in non-controlling interest allocation	(18,833)			(18,833)			(4,129)	(22,962)
Non-cash equity compensation expenses	1,569			1,569				1,569
Currency translation adjustment - net of tax	(3,735)					(3,735)	(1,322)	(5,057)
Unrealized gain (loss) on interest rate swaps designated as cash flow hedges-net of tax	324					324	108	432
Adjustments of deferred taxes, net of amounts payable under tax receivable agreements and changes from Focus LLC interest transactions	490			490				490
Ending balance at Sep. 30, 2021	675,055	$ 603	$ 123	659,541	17,465	(2,677)	226,246	901,301
Ending Balance (in shares) at Sep. 30, 2021		60,315,341	12,338,777
Beginning balance at Dec. 31, 2021	870,544	$ 653	$ 114	841,753	24,995	3,029	246,864	1,117,408
Beginning balance (in shares) at Dec. 31, 2021		65,320,124	11,439,019
Increase (Decrease) in shareholders' equity
Net income	91,434				91,434		35,255	126,689
Issuance of units in connection with an acquisition and contingent consideration	7		$ 7					7
Issuance of units in connection with an acquisition and contingent consideration (in shares)			700,085
Issuance (cancellation) of common stock in connection with exercise of Focus LLC common unit exchange rights	19,592	$ 5	$ (5)	19,592				19,592
Issuance (cancellation) of common stock in connection with exercise of Focus LLC common unit exchange rights (in shares)		486,573	(486,573)
Issuance of common stock in connection with exercise of Focus LLC incentive unit exchange rights	702			702				702
Issuance of common stock in connection with exercise of Focus LLC incentive unit exchange rights (in shares)		17,114
Exercise of stock options	1,158			1,158				1,158
Exercise of stock options (in shares)		42,076
Restricted stock units vesting and related withholdings (in shares)		45
Restricted common units vesting (in shares)			1,162
Change in non-controlling interest allocation	65,618			65,618			(56,682)	8,936
Non-cash equity compensation expenses	6,323			6,323				6,323
Currency translation adjustment - net of tax	(16,574)					(16,574)	(4,088)	(20,662)
Unrealized gain (loss) on interest rate swaps designated as cash flow hedges-net of tax	24,923					24,923	6,888	31,811
Adjustments of deferred taxes, net of amounts payable under tax receivable agreements and changes from Focus LLC interest transactions	(5,104)			(5,104)				(5,104)
Ending balance at Sep. 30, 2022	1,058,623	$ 658	$ 116	930,042	116,429	11,378	228,237	1,286,860
Ending Balance (in shares) at Sep. 30, 2022		65,865,932	11,653,693
Beginning balance at Jun. 30, 2022	1,014,035	$ 654	$ 120	910,222	87,180	15,859	234,821	1,248,856
Beginning balance (in shares) at Jun. 30, 2022		65,442,389	12,034,104
Increase (Decrease) in shareholders' equity
Net income	29,249				29,249		9,040	38,289
Issuance (cancellation) of common stock in connection with exercise of Focus LLC common unit exchange rights	15,469	$ 4	$ (4)	15,469				15,469
Issuance (cancellation) of common stock in connection with exercise of Focus LLC common unit exchange rights (in shares)		381,573	(381,573)
Issuance of common stock in connection with exercise of Focus LLC incentive unit exchange rights	615			615				615
Issuance of common stock in connection with exercise of Focus LLC incentive unit exchange rights (in shares)		15,158
Exercise of stock options	736			736				736
Exercise of stock options (in shares)		26,767
Restricted stock units vesting and related withholdings (in shares)		45
Restricted common units vesting (in shares)			1,162
Change in non-controlling interest allocation	1,009			1,009			(14,578)	(13,569)
Non-cash equity compensation expenses	2,226			2,226				2,226
Currency translation adjustment - net of tax	(10,666)					(10,666)	(2,571)	(13,237)
Unrealized gain (loss) on interest rate swaps designated as cash flow hedges-net of tax	6,185					6,185	1,525	7,710
Adjustments of deferred taxes, net of amounts payable under tax receivable agreements and changes from Focus LLC interest transactions	(235)			(235)				(235)
Ending balance at Sep. 30, 2022	$ 1,058,623	$ 658	$ 116	$ 930,042	$ 116,429	$ 11,378	$ 228,237	$ 1,286,860
Ending Balance (in shares) at Sep. 30, 2022		65,865,932	11,653,693