Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Cash and Cash Equivalents

Below is a table presenting the beginning-of-period and end-of-period cash amounts from the Company’s Consolidated Balance Sheets and the total cash amounts presented in the Consolidated Statements of Cash Flows (in thousands).

	December 31,
	2021		2020		2019		2018
Cash and cash equivalents	$	756,493	$	712,583	$	280,836	$	156,368
Restricted cash classified in (1):
Prepaid expenses and other current assets	4,109		—		—		2,295
Cash and cash equivalents and restricted cash per the Consolidated Statements of Cash Flows	$	760,602	$	712,583	$	280,836	$	158,663

(1)Restricted cash consists of escrow accounts established in connection with certain of the Company’s business acquisitions. Generally, such cash is restricted to use due to provisions contained in the underlying stock or asset purchase agreement. The Company will disburse the restricted cash to the sellers of the businesses upon satisfaction of any contingencies described in such agreements (e.g., potential indemnification claims, etc.).

Schedule of Restricted Cash

Below is a table presenting the beginning-of-period and end-of-period cash amounts from the Company’s Consolidated Balance Sheets and the total cash amounts presented in the Consolidated Statements of Cash Flows (in thousands).

	December 31,
	2021		2020		2019		2018
Cash and cash equivalents	$	756,493	$	712,583	$	280,836	$	156,368
Restricted cash classified in (1):
Prepaid expenses and other current assets	4,109		—		—		2,295
Cash and cash equivalents and restricted cash per the Consolidated Statements of Cash Flows	$	760,602	$	712,583	$	280,836	$	158,663

(1)Restricted cash consists of escrow accounts established in connection with certain of the Company’s business acquisitions. Generally, such cash is restricted to use due to provisions contained in the underlying stock or asset purchase agreement. The Company will disburse the restricted cash to the sellers of the businesses upon satisfaction of any contingencies described in such agreements (e.g., potential indemnification claims, etc.).

Schedule of Property, Plant and Equipment

Property, equipment and leasehold improvements, net are presented in the table below (in thousands).

	Useful Life	December 31,
Category	(Years)	2021		2020
Computer equipment and software	2 - 7	$	304,386	$	277,973
Furniture and equipment	3 - 8	97,050		114,622
Leasehold improvements	2 - 15	253,451		283,773
Total cost		654,887		676,368
Less — accumulated depreciation and amortization		(381,325)		(339,603)
Property, equipment and leasehold improvements, net		$	273,562	$	336,765