Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2022	May 31, 2022	Apr. 19, 2022	Dec. 31, 2021	Aug. 02, 2021
Business Acquisition [Line Items]
Goodwill	$ 1,615,694			$ 1,652,723
Goodstuff Holdings Limited
Business Acquisition [Line Items]
Cash and cash equivalents				30,985
Accounts receivable				28,685
Other current assets				3,207
Fixed assets				237
Right-of-use lease assets - operating leases				2,060
Intangible assets				14,974
Other assets				55
Accounts payable				(6,344)
Accruals and other liabilities				(27,353)
Advance billings				(15,956)
Current portion of lease liabilities				(857)
Income taxes payable				(967)
Long-term portion of lease liabilities				(3,744)
Other liabilities				(1,204)
Net liabilities assumed				23,778
Goodwill				4,410
Purchase price consideration				$ 28,188
MDC
Business Acquisition [Line Items]
Cash and cash equivalents					$ 130,197
Accounts receivable					398,736
Other current assets					41,291
Fixed assets					81,343
Right-of-use lease assets - operating leases					252,739
Intangible assets					810,900
Other assets					18,282
Accounts payable					(139,590)
Accruals and other liabilities					(307,439)
Advance billings					(211,212)
Current portion of lease liabilities					(54,009)
Current portion of deferred acquisition consideration					(53,054)
Long-term debt					(901,736)
Revolving credit facility					(109,954)
Long-term portion of deferred acquisition consideration					(8,056)
Long-term portion of lease liabilities					(283,637)
Other liabilities					(139,026)
Redeemable noncontrolling interests					(25,990)
Preferred shares					(209,980)
Noncontrolling interests					(151,090)
Net liabilities assumed					(861,285)
Goodwill					1,290,347
Purchase price consideration					429,062
BNG
Business Acquisition [Line Items]
Cash and cash equivalents			$ 2,771
Accounts receivable					7,638
Other current assets					1,634
Fixed assets					2,338
Intangible assets					12,410
Other assets					1,416
Accounts payable					(6,855)
Accruals and other liabilities					(4,896)
Advance billings					(1,095)
Other liabilities					(3,448)
Net liabilities assumed			11,913
Goodwill					$ 25,552
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed Less Deferred Acquisition Consideration, Net			$ 37,465
TMA Direct
Business Acquisition [Line Items]
Accounts receivable		$ 582
Other current assets		669
Intangible assets		13,200
Accounts payable		(379)
Accruals and other liabilities		(270)
Noncontrolling interests		(2,667)
Net liabilities assumed		11,135
Goodwill		6,569
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed Less Deferred Acquisition Consideration, Net		$ 17,704