Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 262,171	$ 217,952	$ 196,247	$ 184,239	$ 480,123	$ 380,486
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation					43,783	36,094
Stock-based compensation					66,648	35,632
Provision for credit losses on accounts and other receivables					52,704	8,521
Amortization of deferred financing costs and discounts					4,131	3,248
Amortization of intangible assets and premium on receivables					111,493	98,853
Loss on extinguishment of debt					1,934	6,230
Deferred income taxes					(10,864)	8,216
Other non-cash operating loss					425	72
Changes in operating assets and liabilities (net of acquisitions/dispositions):
Accounts and other receivables					(1,225,705)	(706,574)
Prepaid expenses and other current assets					(89,933)	115,239
Other assets					(48,270)	20,715
Accounts payable, accrued expenses and customer deposits					655,384	349,710
Net cash provided by operating activities					41,853	356,442
Investing activities
Acquisitions, net of cash acquired					(33,744)	(114,994)
Purchases of property and equipment					(66,629)	(45,765)	$ (111,530)	$ (78,425)
Other					0	(2,281)
Net cash used in investing activities					(100,373)	(163,040)
Financing activities
Proceeds from issuance of common stock					18,837	35,921
Repurchase of common stock					(795,302)	(416,585)
Borrowings on securitization facility, net					482,000	300,000
Deferred financing costs					(337)	(21,039)
Proceeds from notes payable					3,000,000	1,150,000
Principal payments on notes payable					(2,777,000)	(419,250)
Borrowings from revolver					1,550,000	405,000
Payments on revolver					(1,356,000)	(623,851)
Borrowings (payments) on swing line of credit, net					194	(51,157)
Other					0	(366)
Net cash provided by financing activities					122,392	358,673
Effect of foreign currency exchange rates on cash					41,866	30,609
Net increase in cash and cash equivalents and restricted cash					105,738	582,684
Cash and cash equivalents and restricted cash, beginning of period		$ 2,250,695		$ 1,476,619	2,250,695	1,476,619	1,476,619
Cash and cash equivalents and restricted cash, end of period	$ 2,356,433		$ 2,059,303		2,356,433	2,059,303	$ 2,250,695	$ 1,476,619
Supplemental cash flow information
Cash paid for interest					73,323	54,818
Cash paid for income taxes					$ 215,653	$ 113,969