Organization and Significant Accounting Policies - Disaggregation Of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 889,450	$ 873,707	$ 1,759,051	$ 1,695,499
Branded Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	235,979	295,221	492,971	585,062
Branded Services [Member] \| Brokerage Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	112,089	89,561	226,407	179,593
Branded Services [Member] \| Branded Merchandising Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	84,609	116,705	168,707	231,450
Branded Services [Member] \| Omni Commerce Marketing Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	39,281	88,955	97,857	174,019
Experiential Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	416,311	347,706	801,791	661,726
Retail Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	237,160	230,780	464,289	448,711
Retail Services [Member] \| Retail Merchandising Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	193,937	182,284	371,475	353,354
Retail Services [Member] \| Advisory Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	30,313	30,675	65,722	64,270
Retail Services [Member] \| Agency Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 12,910	$ 17,821	$ 27,092	$ 31,087