Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Lessee, Lease, Description
Operating lease, liability, including sublease receivables	$ 712,800		$ 712,800		$ 723,900
Operating lease, liability	702,080		702,080		712,849
Operating lease, liability, portion ring-fenced by special purpose vehicles	36,600		36,600		36,500
Operating lease, future contracted revenues and sublease income			174,800		$ 183,700
Operating lease costs	31,800	$ 31,900	100,200	$ 88,600
Operating lease payments			91,100	81,400
Short-term lease expense	300	200	600	900
Sublease income	800	200	2,300	700
Lease impairment	$ 3,500	2,600	$ 3,500	2,600
Weighted average discount rate	4.79%		4.79%		4.61%
Weighted average lease term	6 years 8 months 12 days		6 years 8 months 12 days		7 years
Right-of-use assets	$ 605,230		$ 605,230		$ 638,592
Right-of-use liabilities	$ 102,589		$ 102,589		$ 96,860
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts payable, accrued expenses and other liabilities (see Note 27)		Accounts payable, accrued expenses and other liabilities (see Note 27)		Accounts payable, accrued expenses and other liabilities (see Note 27)
Right-of-use liabilities, non-current	$ 610,161		$ 610,161		$ 627,088
Rent expense	40,400	$ 35,900	120,900	$ 107,900
Management services, servicing fees and other
Lessee, Lease, Description
Operating lease, liability	$ 185,100		$ 185,100		$ 188,000
Minimum
Lessee, Lease, Description
Remaining lease terms	1 year		1 year
Options to extend leases	1 year		1 year
Maximum
Lessee, Lease, Description
Remaining lease terms	12 years		12 years
Options to extend leases	10 years		10 years