Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ 18,185	$ 42,569	$ (3,714)	$ 136,209
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization			174,880	196,443
Amortization of financing costs and discounts			2,051	21,295
Non-cash operating lease costs			9,043	8,366
Share-based compensation			20,806	19,119
Provision for credit losses on accounts receivable			(1,142)	7,934
Deferred income taxes, net			(13,552)	2,537
Gain on extinguishment of debt, net	(10,112)	0	(11,505)	0
Gain on sale of businesses	0	24,600	0	21,798
Goodwill impairment on business	27,369	0	27,369	32,629
Changes in fair value of contingent consideration			(2,305)	(567)
Loss (income) from equity method investments			10,077	(16,596)
Unrealized gain (loss) on short-term investments held at the reporting date			14,165	0
Gain (loss) on investments, net			47,772	16,677
Other			269	9,591
Decrease (increase) in:
Accounts receivable (includes $9,425 and $0 with related parties)			85,121	49,888
Prepaid expenses and other current assets			3,177	(10,610)
Operating lease right-of-use assets			3,851	2,833
Other assets			(12,518)	(2,378)
Increase (decrease) in:
Accounts payable and accrued expenses			(24,974)	(1,409)
Income taxes payable			13,529	(37,863)
Deferred revenue			(25,400)	4,774
Operating lease liabilities			(23,027)	(22,179)
Liability for uncertain tax positions			2,893	(2,903)
Other long-term liabilities			(3,647)	(5,336)
Net cash provided by operating activities			293,219	430,252
Cash flows from investing activities:
Proceeds from sale of available-for-sale investments			0	663
Investment in available-for-sale securities			(15,000)	0
Distribution from equity method investment			0	15,327
Purchases of equity method investment			0	(22,249)
Purchases of equity investments			0	(999)
Purchases of property and equipment			(80,767)	(87,495)
Acquisition of businesses, net of cash received			(104,094)	(112,444)
Proceeds from sale of businesses, net of cash divested			0	48,876
Purchases of intangible assets			0	(1,255)
Net cash used in investing activities			(199,861)	(159,576)
Cash flows from financing activities:
Payment of debt			(166,904)	(402,414)
Proceeds from term loan			112,286	0
Debt extinguishment costs			(756)	0
Proceeds from bridge loan			0	485,000
Repurchase of common stock			(76,545)	(29,855)
Issuance of common stock under employee stock purchase plan			5,235	4,232
Exercise of stock options			148	2,880
Deferred payments for acquisitions			(14,734)	(13,387)
Other			(559)	(6,619)
Net cash (used in) provided by financing activities			(141,829)	39,837
Effect of exchange rate changes on cash and cash equivalents			(24,454)	(6,698)
Net change in cash and cash equivalents			(72,925)	303,815
Cash and cash equivalents at beginning of period			694,842	242,652	$ 242,652
Cash and cash equivalents at beginning of period associated with discontinued operations			0	66,210	66,210
Cash and cash equivalents at beginning of period associated with continuing operations			694,842	176,442	176,442
Cash and cash equivalents at end of period	621,917	546,467	621,917	546,467	694,842
Cash and cash equivalents at end of period associated with discontinued operations	0	31,210	0	31,210	0
Cash and cash equivalents at end of period associated with continuing operations	$ 621,917	$ 515,257	$ 621,917	$ 515,257	$ 694,842