Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2022	May 31, 2022	Apr. 19, 2022	Dec. 31, 2021	Aug. 02, 2021
Business Acquisition [Line Items]
Goodwill	$ 1,668,892			$ 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				4,275
Purchase price consideration				$ 28,053
MDC
Business Acquisition [Line Items]
Cash and cash equivalents					$ 130,153
Accounts receivable					413,839
Other current assets					44,198
Fixed assets					80,047
Right-of-use lease assets - operating leases					252,739
Intangible assets					810,900
Other assets					18,418
Accounts payable					(171,019)
Accruals and other liabilities					(307,281)
Advance billings					(211,403)
Current portion of lease liabilities					(48,517)
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					(289,128)
Other liabilities					(132,394)
Redeemable noncontrolling interests					(25,990)
Preferred shares					(209,980)
Noncontrolling interests					(151,090)
Net liabilities assumed					(869,308)
Goodwill					1,298,370
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		54
Intangible assets		9,290
Other assets		2,800
Accounts payable		(379)
Accruals and other liabilities		(270)
Noncontrolling interests		(2,667)
Net liabilities assumed		9,410
Goodwill		10,503
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed Less Deferred Acquisition Consideration, Net		$ 19,913