CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Cantor	Additional Paid-in Capital	Additional Paid-in Capital Cantor	Treasury Stock	Retained Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest in Subsidiaries	Class A Common Stock Common Stock	Class B Common Stock Common Stock
Beginning balance at Dec. 31, 2023	$ 898,156		$ 2,105,130		$ (67,414)	$ (1,119,182)	$ (38,582)	$ 13,073	$ 4,036	$ 1,095
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	49,041					49,210		(169)
Other comprehensive income (loss), net of tax	(4,829)						(4,688)	(141)
Equity-based compensation	53,577		53,527		(12)				62
Dividends to common stockholders and participating RSU holders	(4,847)					(4,847)
Issuance of Class A common stock (net of costs)	(299)		(299)
Repurchase of Class A common stock	(68,609)				(68,609)
Forfeiture of Class A common stock	(785)		635		(1,420)
Contributions of capital to and from Cantor for equity-based compensation		$ 301		$ 301
Issuance of Class A common stock and RSUs for acquisitions	3,163		3,158						5
Other	2		2
Ending balance at Mar. 31, 2024	924,871		2,162,454		(137,455)	(1,074,819)	(43,270)	12,763	4,103	1,095
Beginning balance at Dec. 31, 2024	1,079,239		2,311,104		(331,728)	(1,026,359)	(59,849)	180,732	4,244	1,095
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	53,429					55,164		(1,735)
Other comprehensive income (loss), net of tax	6,323						6,153	170
Equity-based compensation	33,268		33,207		(5)				66
Dividends to common stockholders and participating RSU holders	(9,857)					(9,857)
Issuance of Class A common stock (net of costs)	(586)		(586)
Repurchase of Class A common stock	(23,125)				(23,125)
Forfeiture of Class A common stock	(89)		137		(226)
Contributions of capital to and from Cantor for equity-based compensation		$ 828		$ 828
Issuance of Class A common stock and RSUs for acquisitions	3,521		3,517						4
Ending balance at Mar. 31, 2025	$ 1,142,951		$ 2,348,207		$ (355,084)	$ (981,052)	$ (53,696)	$ 179,167	$ 4,314	$ 1,095